JP3367644B2 - Deflection yoke device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke device having a correction coil for convergence adjustment and the like.

[0002]

2. Description of the Related Art FIG. 6 is a perspective view showing an example of a conventional deflection yoke device. In FIG. 6, this deflection yoke device has a large diameter portion on one side (the lower side in the drawing) and a small diameter portion on the other side (the upper side in the drawing) due to, for example, a separator 1 in which a pair of semi-annular type is combined. It has a funnel shape. The large diameter portion is on the screen (face) side of the cathode ray tube, and the small diameter portion is on the neck side.

A pair of saddle type horizontal deflection coils (not shown) are mounted on the inner surface of the separator 1, a pair of saddle type vertical deflection coils 3 are mounted on the outer surface thereof, and the separator 1 has a horizontal deflection coil 2 And the vertical deflection coil 3 are electrically insulated and held. A core 4 made of ferrite or the like is mounted on the outer surface of the vertical deflection coil 3.

The deflection yoke device thus constructed usually requires a circuit for correcting the deflection characteristics, and a substrate 5 having such a circuit mounted thereon is attached to the side surface of the separator 1. Since a high voltage is applied to the circuit of the substrate 5, the substrate 5 is covered with a protective cover made of an insulating material for the purpose of preventing electric shock and protecting the circuit, but the protective cover is removed here. It shows the state.

The neck side of the separator 1 is provided with a plurality of flanges 1a1, 1a2, 1a3 (hereinafter referred to as neck side flanges) 1a, and the face side is provided with flanges (hereinafter referred to as face side flanges). 1)
b is provided. On the most neck side flange 1a1 of the neck side flange 1a, a four-pole correction coil 7 called a pair of 4P coils is fitted. The correction coil 7 is for correcting a coma error called VCR.

On the flange 1a3 closest to the face, a claw 8 for mounting the substrate 5 on the separator 1 is integrally formed. The board 5 is formed with a hole 5a, and the claw 8 provided on the flange 1a3 is engaged with the hole 5a. On the other hand, the face-side flange 1b is provided with a pair of plate-shaped ribs 9 by integral molding. The substrate 5 is held with its lower end portion sandwiched by a pair of ribs 9. In this way, the substrate 5 is attached to the side surface of the separator 1 by the claws 8 and the ribs 9 provided on the flange 1a3.

A plurality of pins 10, which are terminals for connecting lead wires, are press-fitted into the substrate 5, and although not shown in the drawings, the horizontal deflection coil and the vertical deflection coil 3 are inserted into these pins 10. Various kinds of lead wires are entangled and soldered.

Further, the electrically insulating bobbin holder 18 includes a correction coil 13 for correcting XV misconvergence (hereinafter referred to as a differential coil 13) and a variable inductance coil 1 for correcting XH misconvergence.
6 is attached, and this bobbin holder 18 is attached to the neck side flange 1a3. The variable inductance coil 16 is also a correction coil.

The differential coil 13 has a cylindrical hollow portion 13a1.
And a bobbin 13a provided with a thread (not shown) mounted on the bobbin 13a.
(Referred to as a screw core) and a pair of coils 13c wound around the bobbin 13a. Bobbin 13
Elastic claws 13d are integrally formed at both ends in the longitudinal direction of a. The bobbin holder 18 has
A pair of holes 18a are formed, and the claw 1 is inserted in the holes 18a.
The 3d is engaged and the differential coil 13 is mounted on the bobbin holder 18.

The variable inductance coil 16 is constructed as shown in FIG. In FIG. 7, the variable inductance coil 16 is a bobbin 16 having a cylindrical hollow portion 16a1 formed of an insulating material such as plastic resin.
a, a core 16b (hereinafter, referred to as a screw core 16b) formed of ferrite or the like, which is mounted in the bobbin 16a and has a screw formed on the outer peripheral surface, and a coil wound between the flanges 16a2 and 16a3 of the bobbin 16a. And 16c. A hexagonal penetrating or non-penetrating hole 16b1 is formed in the screw core 16b.

The bobbin 16a has a core holding portion 16a4 around which the coil 16c is not wound. Bobbin 16a
Elastic claws 16d are integrally formed at both ends in the longitudinal direction. The bobbin holder 18 is formed with a pair of holes (not shown) different from the above holes 18a, and the claw 16d engages with the holes to mount the variable inductance coil 16 on the bobbin holder 18.

In the variable inductance coil 16 thus constructed, a jig 30 as shown in FIG. 7 is used and the jig 30 is inserted into the hole 16b1 of the screw core 16b to move the screw core 16b in the longitudinal direction of the bobbin 16a. By doing so, the inductance of the coil 16c can be freely adjusted. The longitudinal direction of the variable inductance coil 16 is also the moving direction of the screw core 16b. The XH misconvergence is corrected by adjusting the inductance of the variable inductance coil 16. The position of the screw core mounted on the differential coil 13 is also adjusted in the same manner.

FIG. 8 shows a variable inductance coil 16
FIG. 9 is a cross-sectional view taken along a plane orthogonal to the longitudinal direction in the core holding portion 16a4. As shown in FIG. 8, in the hollow portion 16a1 of the bobbin 16a (the inner peripheral surface of the bobbin 16),
A plurality of rib-shaped projections 16e are integrally formed, and the hollow portion 16a1 and the screw core 16b are tightly fitted. The rib-shaped protrusions 16e are set to have a number such that the rotation torque for rotating the screw core 16b has an appropriate value, and here, the number is three. The differential coil 1
The cross-sectional shape of 3 is almost the same.

FIG. 9 shows the operation of mounting the screw core 16b in the hollow portion 16a1 of the bobbin 16a. Figure 9
As shown in (a), the screw core 16b is attached to, for example, the bobbin 1.
The cavity 16a1 is formed by the jig 30 from the left end of 6a in the figure.
Screw it in, and as shown in FIG. 9 (b), screw the screw core 16b to the other end as it is. As a result, the screw core 16b is mounted on the bobbin 16a while forming a screw on the protrusion 16e, and the screw is formed on the entire protrusion 16e in the longitudinal direction. This is called a self tap type. Here, the screw core 16b is manually attached to the bobbin 16a.
Although the example of mounting on an automatic machine is shown, it may be mounted on an automatic machine.

Further, the screw core 16a is rotated in the reverse direction, and the screw core 16b is moved so as to be positioned substantially at the center in the longitudinal direction of the bobbin 16a, as shown in FIG. 9 (c). Figure 9
The jig 30 is not shown in FIGS. In the differential coil 13, just like the variable inductance coil 16, the screw core is attached in the procedure as shown in FIGS.

The deflection yoke device configured as described above is mounted on an inspection cathode ray tube at the time of shipping inspection, and the deflection characteristics are adjusted. An inspection cathode ray tube is a combination of a cathode ray tube and a deflection yoke device for sale.
It is a cathode ray tube specified by a manufacturer called TC (Integrated Tube Component) manufacturer.

When the deflection yoke device is delivered to the ITC maker, the deflection yoke device is attached to the inspection cathode ray tube,
The operator moves the bobbines 13a, 16a in the longitudinal direction while rotating the screw core of the differential coil 13 or the screw core 16b of the variable inductance coil 16 with the jig 30 or the like to change the deflection characteristics. As a result, XV misconvergence and XH misconvergence are corrected.

Then, the ITC maker mounts the delivered deflection yoke device on a mass production cathode ray tube. Since there is a slight difference in electrical characteristics between the mass production cathode ray tube and the above-described inspection cathode ray tube, the ITC maker has the jig 30 even when the deflection yoke device is attached to the mass production cathode ray tube (hereinafter referred to as the ITC state). The screw core 1 of the differential coil 13 or the screw core 1 of the variable inductance coil 16
6b is rotated to adjust its position, and X on the cathode ray tube
Readjust to eliminate V and XH misconvergence. IT readjusted in this way
Products in the C state will be shipped to computer display equipment manufacturers and the like.

[0019]

By the way, when rotating the screw core 16b of the variable inductance coil 16 to adjust its position, it is important for the operator to feel the screw core 16b as smoothly as possible when rotating. is there. If the feel of the screw core 16b during the rotating work is smooth, the efficiency of the adjusting work can be improved. This also applies to the screw core of the differential coil 13. In the following, only the variable inductance coil 16 will be described as a representative.

The deterioration of the feel when rotating the screw core 16b is considered to be caused by the following. The outer diameter of the screw core 16b is not a perfect circle, and as shown in FIG. 10, for example, with respect to the basic radius r = 3 mm, α is partially 1/1000 m.
It is often distorted with a diameter difference of about m. A portion having a radius of r + α will be referred to as a C portion. Note that FIG.
0 is exaggerated for ease of understanding. As described above, since the outer diameter of the screw core 16b is distorted, the resistance increases when the C portion passes between the protrusions 16e, and the resistance decreases when the C portion passes between the protrusions 16e. As a result, the C portion has a feeling of being caught when passing through the protrusion 16e, and the feeling of rotating the screw core 16b becomes discontinuous.

To solve this problem, the number of protrusions 16e formed in the hollow portion 16a1 of the bobbin 16a should be increased. However, if the number of protrusions 16e is increased, the rotational torque may increase significantly. When the rotational torque increases, it becomes difficult or impossible to manually adjust the position of the screw core 16b. Therefore, it is not a good idea to increase the number of the protrusions 16e.

The present invention has been made in view of the above problems, and in a deflection yoke device having a correction coil in which a screw core is mounted in a hollow portion formed in a bobbin, the rotation of the screw core is adjusted. It is an object of the present invention to provide a deflection yoke device which has a good feel and can improve the efficiency of the screw core adjustment work.

[0023]

The present invention has the following constitution in order to solve the problems of the above-mentioned conventional techniques . You
That is, claim 1 is a bobbin in which the hollow portion 16a1 is formed.
16a and a screw is formed on the surface of the hollow portion 16a1
In the deflection yoke device including the correction coil 160 having the core 16b attached to the bobbin 16a,
The length of the cavity 16a1 on the inner peripheral surface of the cavity 16a1
Extending in the longitudinal direction formed on one side in the direction
A plurality of first projections 16e1 that form the inner peripheral surface
Of the length formed on the other side in the longitudinal direction.
The second protrusion 16e2 consisting of a plurality of pieces extending in the hand direction
And each of the first and second protrusions 16e1 and 16e2
At least one set when each of these is a set of protrusions
Of the protrusions of the
At different positions in the circumferential direction of the cavity 16a1.
A deflection yoke device characterized in that
2 includes the first and second protrusions 16e1 and 16e2,
Arrange them at equal intervals in the circumferential direction and
In the circumferential direction, at the approximate center between the other two protrusions
The deflection yoke device according to claim 1, wherein the deflection yoke device is arranged.
It is a place.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The deflection yoke device of the present invention will be described below with reference to the accompanying drawings. 1 is a perspective view showing an embodiment of the deflection yoke device of the present invention, and FIG. 2 is a variable inductance coil 1 used in the deflection yoke device of the present invention.
FIG. 3 is a perspective view showing an example of a specific configuration of 60, FIG. 3 is a sectional view of the variable inductance coil 160 shown in FIG. 2 taken along a plane along the longitudinal direction, and FIG. 4 is a longitudinal direction of the variable inductance coil 160 shown in FIG. FIG. 5 is a sectional view taken along a plane orthogonal to the variable inductance coil 16 shown in FIG.
It is sectional drawing for demonstrating 0. In FIG. 1, the same parts as those in FIG. 6 are designated by the same reference numerals.

In FIG. 1, this deflection yoke device has a large-diameter portion on one side (the lower side in the figure) and the other side (the upper side in the figure) by a separator 1 in which a pair of semi-annular ones are combined. It is formed in a funnel shape with a small diameter portion. The large diameter portion is on the screen (face) side of the cathode ray tube, and the small diameter portion is on the neck side.

A pair of saddle type horizontal deflection coils (not shown) are mounted on the inner surface of the separator 1, a pair of saddle type vertical deflection coils 3 are mounted on the outer surface thereof, and the separator 1 has a horizontal deflection coil 2 And the vertical deflection coil 3 are electrically insulated and held. A core 4 made of ferrite or the like is mounted on the outer surface of the vertical deflection coil 3.

The deflection yoke device thus constructed usually requires a circuit for correcting the deflection characteristic, and a substrate 5 having such a circuit mounted thereon is attached to the side surface of the separator 1. Since a high voltage is applied to the circuit of the substrate 5, the substrate 5 is covered with a protective cover made of an insulating material for the purpose of preventing electric shock and protecting the circuit, but the protective cover is removed here. It shows the state.

The neck side of the separator 1 is provided with a plurality of flanges 1a1, 1a2, 1a3 (hereinafter referred to as neck side flanges) 1a, and the face side is provided with flanges (hereinafter referred to as face side flanges). 1)
b is provided. On the most neck side flange 1a1 of the neck side flange 1a, a four-pole correction coil 7 called a pair of 4P coils is fitted. The correction coil 7 is for correcting a coma error called VCR.

A claw 8 for mounting the substrate 5 on the separator 1 is integrally formed on the flange 1a3 closest to the face. The board 5 is formed with a hole 5a, and the claw 8 provided on the flange 1a3 is engaged with the hole 5a. On the other hand, the face-side flange 1b is provided with a pair of plate-shaped ribs 9 by integral molding. The substrate 5 is held with its lower end portion sandwiched by a pair of ribs 9. In this way, the substrate 5 is attached to the side surface of the separator 1 by the claws 8 and the ribs 9 provided on the flange 1a3.

A plurality of pins 10, which are terminals for connecting lead wires, are press-fitted into the substrate 5, and although not shown in the drawings, the horizontal deflection coil and the vertical deflection coil 3 are inserted into these pins 10. Various kinds of lead wires are entangled and soldered.

Further, the bobbin holder 18 having electrical insulation has a correction coil 130 (hereinafter referred to as a differential coil 130) for correcting XV misconvergence, and an XH.
A variable inductance coil 160 that corrects misconvergence is attached to the bobbin holder 18.
Is attached to the neck side flange 1a3. The variable inductance coil 160 is also a correction coil. The variable inductance coil 160 is connected in parallel to the deflection auxiliary coil connected to the horizontal deflection coil. For details of the connection method and the operation of the deflection auxiliary coil or the variable inductance coil 160, the applicant's prior application, Japanese Patent Application No.
0-264365.

The differential coil 130 has a hollow cylindrical portion 13
bobbin 13a provided with a1 and a screw formed on the outer peripheral surface,
The bobbin 13a includes a core (not shown) (hereinafter, referred to as a screw core) mounted therein, and a pair of coils 13c wound around the bobbin 13a. At both ends of the bobbin 13a in the longitudinal direction, elastic claws 13d are provided.
Are integrally formed. The bobbin holder 18 is formed with a pair of holes 18 a, and the claw 13 d engages with the holes 18 a to mount the differential coil 130 on the bobbin holder 18.

The variable inductance coil 160 is shown in FIG.
It is configured as shown in. In FIG. 2, the variable inductance coil 160 includes a bobbin 16a having a cylindrical hollow portion 16a1 formed of an insulating material such as a plastic resin, and a ferrite etc. mounted on the bobbin 16a with screws formed on the outer peripheral surface. Core 16b formed by
The coil 16c (hereinafter referred to as “screw core 16b”) and the coil 16c wound between the flanges 16a2 and 16a3 of the bobbin 16a are provided. A hexagonal penetrating or non-penetrating hole 16b1 is formed in the screw core 16b.

The bobbin 16a has a core holding portion 16a4 around which the coil 16c is not wound. Bobbin 16a
Elastic claws 16d are integrally formed at both ends in the longitudinal direction. The bobbin holder 18 is formed with a pair of holes (not shown) different from the above holes 18a, and the claw 16d engages with the holes to mount the variable inductance coil 160 on the bobbin holder 18.

In the variable inductance coil 160 thus constructed, the jig 30 as shown in FIG. 2 is used, and the jig 30 is inserted into the hole 16b1 of the screw core 16b to move the screw core 16b in the longitudinal direction of the bobbin 16a. By doing so, the inductance of the coil 16c can be freely adjusted. The longitudinal direction of the variable inductance coil 16 is also the moving direction of the screw core 16b. The XH misconvergence is corrected by adjusting the inductance of the variable inductance coil 160. The position of the screw core mounted on the differential coil 13 is also adjusted in the same manner.

Here, the characteristic part of the present invention will be described in detail. In the following, only the variable inductance coil 160 will be described as a representative. 3 is a cross-sectional view of the variable inductance coil 160 taken along a plane along the longitudinal direction (the moving direction of the screw core 16b), and FIG.
It is sectional drawing which cut | disconnected 60 by the surface (AA surface of FIG. 3) orthogonal to a longitudinal direction in the part of the core holding part 16a4.
The variable inductance coil 160 used in the present invention is characterized by the configuration of the rib-shaped protrusion 16e.

As shown in FIGS. 3 and 4, a plurality of rib-shaped projections 16e1 and 16e2 are integrally formed on the hollow portion 16a1 of the bobbin 16a (the inner peripheral surface of the bobbin 16). The screw core 16b is tightly fitted. The protrusions 16e1 and 16e2 are collectively referred to as the protrusion 16e. In the present invention, the protrusion 16e is discontinuous at the substantially central portion (B portion) in the longitudinal direction of the bobbin 16a, and is a protrusion 16e1 on the left side of FIG. 3 and a protrusion 16e2 on the right side of FIG. The screw core 16b is arranged at a substantially central portion in the longitudinal direction of the bobbin 16a by a procedure described later.

As can be seen from FIG. 4, the protrusions 16e1 and 16e
The three e2 are the most preferable three, and they are formed substantially evenly at intervals of about 120 degrees in the circumferential direction. Protrusion 16
The angular positions of e1 and the protrusion 16e2 are deviated from each other by about 60 degrees, and the protrusion 16e2 is arranged so as to complement the space between the protrusions 16e1. B which is a discontinuous portion of the protrusion 16e
Is the screw core 1 corresponding to the adjustment range of the inductance.
It is within the moving range of 6b. Therefore, the screw core 16b always comes into contact with the six protrusions 16e at all times.

As described with reference to FIG. 10, the screw core 16b
When the outer diameter of is not a perfect circle and has a partially distorted and protruding C portion, the feeling of being caught when the C portion passes through the protrusion 16e is double that of the conventional one. Therefore, the feel of the screw core 16b during the rotating work is almost continuous and extremely smooth. Although the number of the protrusions 16e is substantially six, in one cross section of the screw core 16b, only the three protrusions 16e are in contact with each other, so that the rotational torque does not increase. Since the feel of the screw core 16b during the rotating work is smooth, the position adjustment of the screw core 16b is facilitated, and the delicate position adjustment is facilitated.

The protrusion 16e which is discontinuous in the longitudinal direction
Can be formed by making a die for injection molding the bobbin 16a by a structure in which substantially cylindrical die pieces project from the left and right sides of FIG. In this case, since the protruding length of the mold piece is about half of the total length of the bobbin 16a, the possibility of breakage or deformation of the mold piece is smaller than that in the case of longer length, which is preferable for the life of the mold. Form.

FIG. 5 shows the operation of mounting the screw core 16b in the cavity 16a1 of the bobbin 16a. Figure 5
As shown in (a), the screw core 16b is attached to, for example, the bobbin 1.
The cavity 16a1 is formed by the jig 30 from the left end of 6a in the figure.
The screw core 16b is screwed in, and as shown in FIG. 5B, the screw core 16b is screwed to the other end as it is. As a result, the screw core 16b is mounted on the bobbin 16a while forming a screw on the protrusion 16e, and the screw is formed on the entire protrusion 16e in the longitudinal direction. This is called a self tap type. Here, the screw core 16b is manually attached to the bobbin 16a.
Although the example of mounting on an automatic machine is shown, it may be mounted on an automatic machine.

Further, the screw core 16a is reversely rotated, and the screw core 16b is moved so as to be positioned substantially at the center of the bobbin 16a in the longitudinal direction as shown in FIG. 5 (c). Figure 5
The jig 30 is not shown in FIGS. By the above operation, the screw core 16b becomes the bobbin 1.
It is located almost at the center in the longitudinal direction of 6a and is in the state of FIG.

By the way, in the present embodiment, as the most preferred embodiment, the protrusion 16e1 on one side and the protrusion 16e2 on the other side with respect to the longitudinal direction of the bobbin 16a are formed at equal intervals in the circumferential direction. Further, the protrusions 16e1 and 16e2 are formed so as to be located substantially in the center between the other two protrusions. However, the present invention is not limited to this, and the protrusions 16e1 and 16e2 may not be evenly spaced in the circumferential direction, and the protrusions 16e1 and 16e2 may not be located at the center between the other two protrusions. Good.

Although both the protrusions 16e1 and 16e2 have the same number, they may have different numbers. Protrusion 16e1,1
The number of 6e2 is not limited to the most preferable three,
Other numbers may be used. Furthermore, a plurality of protrusions 16e
Any of the above may be connected continuously. At least one of the plurality of protrusions 16e is the bobbin 16a.
Those which are discontinuous in the longitudinal direction of are included in the present invention.

Further, in the present embodiment, as the most preferable embodiment, as described with reference to FIG. 3, the projection 16e is discontinuous at the substantially central portion (B portion) in the longitudinal direction of the bobbin 16a. It does not necessarily have to be the central portion. If the screw core 16b contacts both of the divided protrusions 16e,
It may be at any position of the intermediate portion between one end and the other end of the bobbin 16a.

The present invention is not limited to the differential coil 130 and the variable inductance coil 160, and can be used for all correction coils in which the core is mounted in the cavity formed in the bobbin. The present invention is not limited to the present embodiment described above, and various modifications can be made without departing from the gist of the present invention.

[0047]

As described above in detail, in the deflection yoke device of the present invention, the bobbin in which the cavity is formed and the surface of the bobbin are formed.
A correction coil having a core formed with a screw and mounted in the cavity , one of the inner peripheral surface of the cavity is provided.
Forming a plurality of first protrusions extending in the longitudinal direction on one side
And a plurality of second protrusions extending in the longitudinal direction on the other side.
To form one of each of the first and second protrusions.
Is a set of protrusions, at least one set of protrusions
Discontinuous in the middle part in the hand direction and around the cavity
Since the protrusions are formed at different positions, the number of protrusions can be substantially increased without increasing the rotation torque of the screw core. Therefore, the feel when rotating and adjusting the screw core becomes extremely good, and the efficiency of the screw core adjusting work can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a variable inductance coil 16 used in the present invention.
It is a perspective view showing an example of a concrete composition of 0.

3 is a sectional view of the variable inductance coil 160 shown in FIG. 2 taken along a plane along a longitudinal direction.

4 is a cross-sectional view of the variable inductance coil 160 shown in FIG. 2 taken along a plane orthogonal to the longitudinal direction.

5 is a cross-sectional view for explaining the variable inductance coil 160 shown in FIG.

FIG. 6 is a perspective view showing a conventional example.

FIG. 7 is a perspective view showing an example of a specific configuration of a variable inductance coil 16 used in a conventional example.

8 is a sectional view of the variable inductance coil 16 shown in FIG. 7 taken along a plane orthogonal to the longitudinal direction.

9 is a sectional view for explaining the variable inductance coil 16 shown in FIG.

FIG. 10 is a diagram for explaining a problem of the conventional example.

[Explanation of symbols]

1 separator 3 Vertical deflection coil 4 core 13a, 16a bobbins 13a1, 16a1 cavity 13c, 16c coil 16b core (screw core) 16e1, 16e2 protrusion 130 Differential coil (correction coil) 160 Variable inductance coil (correction coil)

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01J 29/76

Claims (2)

(57) [Claims] 1. A bobbin having a hollow portion and a screw on the surface.
In a deflection yoke device including a correction coil having a core and a core mounted in the hollow portion, the bobbin includes an inner peripheral surface of the hollow portion in a longitudinal direction of the hollow portion.
A plurality of pieces formed on one side and extending in the longitudinal direction
Is formed on the other side of the inner peripheral surface in the longitudinal direction.
Second protrusions formed by a plurality of elongated protrusions extending in the longitudinal direction
And one of each of the first and second protrusions
When the projections are used, at least one set of
Discontinuously in the middle part of the direction and the circumference of the cavity
A deflection yoke device, which is formed at different positions in different directions . 2. The first and second protrusions are arranged at substantially equal intervals in the circumferential direction, and the first and second protrusions are arranged in the circumferential direction.
Deflection yoke apparatus according to claim 1, characterized in that mutually disposed substantially at the center between the other two projections at.