CN206761123U - Isotropism reading lighting device - Google Patents

Abstract

A kind of isotropism reading lighting device is the utility model is related to, the utility model is on the basis of existing reading lighting technology is analyzed, it is proposed that isotropism reading lighting technology.Namely irradiated by the light in different angle and direction to reading medium, human eye is set to obtain balanced consistent brightness with angle in different directions, infringement of the light incident direction to human eye is preferably minimized, reduce human eye vision fatigue, so as to reduce the near-sighted incidence probability read under lighting environment.

Description

Isotropic reading lighting

technical field

The utility model relates to an isotropic reading lighting device.

Background technique

Vision loss and myopia are a common problem among primary and middle school students, and reading lighting is an important link that affects students' vision.

In order to improve the lighting quality in reading, several methods are mainly used at present: 1. Add frosted glass optical materials in front of the light source, so that the light emitted by the light source is scattered by the ground glass optical device, and the scattered light is irradiated On reading media such as books, no obvious light spots can be formed, thereby reducing eye irritation; 2. Add a type of optical material in front of the light source to convert the point light source into parallel light, and form parallel light irradiation on the reading medium , so as to reduce the local glare area formed by the point light source on the reading medium; 3. Increase the distance between the light source and the reading medium, eliminate the dark area of the reading medium and reduce the axial myopia caused by the dark area entering the eye; 4. Select the reading angle, Adjust the angle between the light and the normal of the reading medium and the angle between the line of sight and the normal of the reading medium to reduce glare.

Although the above four methods use different methods to reduce the formation of glare and increase the comfort of reading, they all have a common defect, which is the anisotropic feeling of light when reading. In the above four reading lighting methods, since the light source is a point light source or a local light source, different incident angles and incident directions will be formed in different small areas of the reading medium. There will be different brightness when viewed in different directions; with different viewing angles and directions, the degree of lightness and darkness perceived by the human eye is also different; for a small area of the reading medium, the reader feels that the reading lighting has anisotropic characteristics. Due to the anisotropic characteristics of reading lighting, the reader will feel the difference in light and shade for the entire area of the reading medium. This difference in light and shade acts on the retina of the eye for a long time, which will cause eye muscle tension and fatigue, and induce myopia.

Utility model content

In view of the above problems, the utility model provides an isotropic reading lighting device which can reduce eye muscle tension and visual fatigue, provide readers with a good reading environment, and reduce the incidence of myopia.

The isotropic reading lighting device of the utility model includes: dividing the area on the reading medium into a plurality of tiny areas, in each micro area 100, constructing a three-dimensional rectangular coordinate with the midpoint of the micro area as the origin, and the normal line of the reading interface The direction is the z axis, and one of the two perpendicular lines on the reading interface is the x axis, and the other is the y axis. The light entering the eye in the tiny area is 101, the projection of the incident light on the xy plane is a projection line 102, the angle between the incident light and the z-axis is the angle angle, the angle between the projection line and the x-axis is the direction angle, through the light emission The arrangement of the device and the arrangement of optical elements on the light-emitting device make the brightness of the light entering the eye remain unchanged no matter how the included angle and direction change.

The isotropic reading lighting device of the utility model comprises: a light-emitting device that irradiates the reading medium on the reading medium, divides the area on the reading medium into a plurality of tiny areas, and in each micro area (100), the midpoint of the micro area Construct a three-dimensional Cartesian coordinate for the origin, the normal direction of the reading interface is the z-axis, one of the two perpendicular lines on the reading interface is the x-axis, and the other is the y-axis; The projection on the xy plane is a projection line (102), the angle between the incident light and the z-axis is an angle angle, and the angle between the projection line and the x-axis is a direction angle;

A plurality of low-power light sources are scattered and linearly arranged on the upper edge of any parallel plane above the reading medium or evenly distributed on the front and left and right sides of any parallel plane above the reading medium. There are optical elements, so that no matter how the angle angle and direction angle change, the brightness of the eye-catching light remains unchanged.

Further, the optical element is composed of three layers, including an outer layer, a middle layer and an inner layer. The light source is placed between the outer layer and the middle layer. The light is reflected; the middle layer and the inner layer are transparent materials with scattering properties. The reflected light and the incident light of the light source are transmitted through the middle layer, so that the direction of the light is scattered; the scattered light is transmitted through the inner layer.

Further, the isotropic lighting device is generally a U-shaped structure, the outermost layer is a wooden structure, and a light reflective aluminum foil material is pasted on the inner surface of the wooden structure, so that the light is reflected after being irradiated on the aluminum foil, and the middle layer And the inner layer is a light-transmitting and opaque acrylic board. The acrylic board is made into a U shape. The acrylic board has the properties of light transmission and astigmatism at the same time. Transmission, scattering and diffusion, the light scattered and diffused by the acrylic plate in the middle layer shines on the acrylic plate in the inner layer, and the acrylic plate in the inner layer transmits, scatteres and diffuses the light again, and the light irradiates on the reading medium Light is isotropic.

Further, the distance between the lamp and the acrylic plate in the middle layer is 5-10 mm.

Beneficial effect

The utility model proposes an isotropic reading lighting technology on the basis of analyzing the existing reading lighting technology. On each tiny area on the reading medium, from different angles and directions, what the eyes experience is the same brightness, that is, isotropy. For the entire area of the reading medium, if each tiny area can maintain the isotropy of the reading illumination, no matter what angle and direction the line of sight and the reading medium are in, the reader will feel a uniform brightness area on the retina of the eye. It has a balanced light perception, thereby reducing eye muscle tension and visual fatigue, providing readers with a good reading environment, and reducing the incidence of myopia.

The utility model can make the reader feel that the reading medium has consistent brightness in different angles and directions; it can minimize the damage of the light direction to the reader's vision; the combination of the isotropic reading lighting technology and the spectrum can obtain an ideal reading lighting.

Description of drawings

Fig. 1 is the incident angle diagram of the utility model isotropic reading lighting device;

Fig. 2 is an incident angle diagram of the isotropic reading lighting device of the present invention;

Fig. 3 is a structural schematic diagram of the isotropic reading lighting device of the present invention.

100 A tiny area on the reading medium; 101 Ray of the eye; 102 The projection of the ray of the eye on the xy plane; 103 The angle between the ray of the eye and the normal line of the reading medium; 104 The angle between the projection of the ray of the eye on the xy plane and the x-axis; 200 Reading A small area on the medium; 201 incident light; 202 projection of incident light on xy plane; 203 angle between incident light and normal of reading medium; 204 angle between projection of incident light on xy plane and x axis; 300 reading medium ; 301 Light incident on the reading medium from different directions; 302 Light emitting device.

detailed description

Below in conjunction with accompanying drawing and embodiment, the specific embodiment of the utility model is described in further detail. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

Taking a certain tiny area on the reading medium (the radius of the tiny area can be arbitrarily small) as an example, in Fig. 1, there is a certain tiny area 100 on the reading medium, and a three-dimensional Cartesian coordinates, the normal direction of the reading interface is the z-axis, and the two perpendicular lines on the reading interface are defined as the x-axis and the other as the y-axis. The ray entering the eye of the tiny area 100 is 101 , and the projection of the ray 101 on the xy plane is a straight line 102 . The included angle between the light ray 101 and the z-axis is 103 , and the included angle between the straight line 102 and the x-axis is 104 . The included angle 103 is referred to as an angle for short in this utility model, and the included angle 104 is referred to as a direction for short in this utility model. Then the two parameters of the included angle 103 and the included angle 104 can uniquely determine the path of the eye ray 101 .

The meaning of isotropy is that no matter how the included angle 103 or the included angle 104 changes, the brightness of the incoming light 101 remains unchanged; the human eye observes a certain tiny area on the reading medium from different directions and angles, and the tiny area of this tiny area The brightness is constant, that is, isotropic.

If every tiny area on the reading medium has isotropic lighting characteristics, no matter what angle and direction the line of sight and the reading medium are, it will not affect the visual experience when reading, which directly brings two benefits. One is that the changes in the position of the two eyes in front, back, left, and right will not cause brightness changes in any small area on the reading medium; Read brightness changes in any tiny area on the media. That is, the brightness of each tiny area on the reading medium has nothing to do with the position of the human eye and the angle and direction of the line of sight.

Readers rely on the resolution ability of the eyes to obtain information during the reading process, and the resolution ability is represented by resolution. The resolution and brightness of the human eye have a direct relationship. The visual device will adjust according to the brightness of the reading medium to obtain the best resolution. If the brightness of the reading medium is unbalanced, the brightness of the reading focus area of the reading medium will change with the movement of the line of sight, which will inevitably cause the adjustment of the visual device. The greater the brightness imbalance of the medium, the more frequent the adjustment of the visual device, the easier it is to cause visual fatigue. On the contrary, if the brightness of the reading medium is balanced, the brightness of the reading focus area of the reading base value remains unchanged as the line of sight moves, and the visual device’s Just adjust slowly, so it is not easy to cause visual fatigue.

As long as the isotropic feature of the illumination of each tiny area on the reading medium and the balanced illumination of the reading medium are ensured, the entire reading medium has a balanced brightness.

Since the surface of the reading medium has a certain degree of roughness, when the light is irradiated on the reading medium, the light will be diffusely reflected. If the light is irradiated from a certain direction, although the light irradiated on the reading medium is diffusely reflected, the intensity of the reflected light at different angles and directions is different, that is to say, different angles and directions have different brightness. Assuming that there is a mirror in the tiny area illuminated by the light of the reading medium, the brightness is the largest in the mirror reflection direction of the light, and the larger the angle with the mirror reflection direction, the smaller the brightness. The light is irradiated from one direction to the reading medium, and the brightness of each tiny area of the reading medium has the characteristics of anisotropy, but the characteristics of isotropy cannot be obtained.

To make the brightness of each tiny area of the reading medium have isotropic characteristics, the incident light of each tiny area must come from different directions and angles. Taking a certain tiny area on the reading medium as an example, in Fig. 2, there is a certain tiny area 200 on the reading medium, a three-dimensional Cartesian coordinate is constructed with the midpoint of the tiny area 200 as the origin, and the normal direction of the reading interface is The z-axis, two lines perpendicular to each other on the reading interface, one is the x-axis and the other is the y-axis. The incident ray 201 on the tiny region 200 is a straight line 202 projected on the xy plane. The included angle between the ray 201 and the z-axis is 203 , and the included angle between the line 202 and the x-axis is 204 . The value range of the included angle 203 is 0-90°, and the value range of the included angle 204 is 0-360°. Ideally, the included angle 203 and the included angle 204 change continuously within the value range, and the incident light 201 The light intensity remains constant, thus ensuring the isotropy of the light intensity on the tiny area 200 of the reading medium. If each tiny area on the reading medium can ensure isotropic and balanced illumination intensity, the entire reading medium can maintain isotropic illumination intensity, thereby ensuring isotropic and balanced brightness of the entire reading medium.

It is difficult to achieve isotropy and equalization of light intensity in each tiny area on the reading medium, and it is not necessary in practical requirements. As long as it is ensured that the brightness of the reading medium is isotropic and balanced at the possible position of the reader's eyes, it will have almost the same effect as the isotropic and balanced brightness of the reading medium under ideal conditions. Under this condition, when the incident light of each tiny region on the reading medium changes in the proper continuous interval of the included angle 203 and the included angle 204, the same illuminance can ensure that the reader feels a consistent and balanced reading medium when reading. brightness. The proper continuous interval of the included angle 203 and the included angle 204 means that when the reader's eyes move back and forth, left and right, the specular reflection line of the line of sight on the reading medium can always be included in the continuous interval.

Figure 3 is a realization scheme of isotropic reading illumination. A light emitting device 302 is made on the left side, right side and the back of the desk. The light emitting device is composed of a light source and optical materials. The light source is a light source close to the natural spectrum such as an incandescent lamp or a halogen lamp. In this way, optical materials include diffusing materials and reflective materials, so that the light emitted by the light source can be transmitted evenly and irradiated on the reading medium. 301 is the light that is incident on the reading medium from different directions. The light 301 is the light that is emitted by the light source and irradiates the reading medium through diffusion, scattering, reflection, etc. View reading media with balanced and consistent brightness. 300 is a reading medium, the reading medium is placed on the reading table, and the reading medium can move within a certain range of the reading table without affecting the balanced and consistent brightness experienced by the eyes.

The optical element consists of three layers, including an outer layer, a middle layer and an inner layer. The light source is placed between the outer layer and the middle layer. The outer layer uses opaque reflective material with diffuse reflection characteristics to reflect the light from the light source. ; The middle layer and the inner layer are transparent materials with scattering properties. The reflected light and the incident light of the light source are transmitted through the middle layer, so that the direction of the light is scattered; the scattered light is transmitted through the inner layer.

Specifically, the isotropic lighting device is generally a U-shaped structure, the outermost layer is a wooden structure, and a light reflective aluminum foil material is pasted on the inner surface of the wooden structure, so that the light is reflected after being irradiated on the aluminum foil, and the middle layer And the inner layer is a light-transmitting and opaque acrylic board. The acrylic board is made into a U shape. The acrylic board has the properties of light transmission and astigmatism at the same time. Transmission, scattering and diffusion, the light scattered and diffused by the acrylic plate in the middle layer shines on the acrylic plate in the inner layer, and the acrylic plate in the inner layer transmits, scatteres and diffuses the light again, and the light irradiates on the reading medium Light is isotropic. The distance between the lamp and the acrylic plate in the middle layer is 5-10 mm. Since the halogen lamp indicates high temperature, it cannot be in direct contact with the acrylic plate in the middle, otherwise the acrylic plate will be deformed by high temperature; the distance between the lamp and the acrylic plate should not be too far, Otherwise, the thickness of the whole device is increased, which is inconvenient to use.

When the reader reads under the reading device in FIG. 3 , he can feel the soft and natural light of the reading lighting, reduce the reading fatigue caused by the light, and reduce the incidence of myopia.

The isotropic reading lighting device of the utility model, the reading medium, and the light-emitting device irradiated on the reading medium divide the area on the reading medium into a plurality of micro-areas, and each micro-area 100 is constructed with the midpoint of the micro-area as the origin A three-dimensional Cartesian coordinate, the normal direction of the reading interface is the z-axis, and the two perpendicular lines on the reading interface are defined as the x-axis and the other as the y-axis. The ray entering the eye of the tiny area is 101, the projection of the incident ray on the xy plane is the projection line 102, the angle between the incident ray and the z-axis is the angle angle, and the angle between the projection line and the x-axis is the direction angle, using multiple Low-power light sources are distributed linearly on the upper edge of the front and left and right sides or evenly distributed on the front and left and right sides. As long as the light source can be evenly irradiated on the reading medium after being diffused by the optical material, the distribution method is reasonable. The device is equipped with optical elements, the optical elements are composed of three layers, divided into outer layer, middle layer and inner layer. The light source is placed between the outer layer and the middle layer. The light is reflected; the middle layer and the inner layer are transparent materials with scattering properties. The reflected light and the incident light of the light source are transmitted through the middle layer, making the direction of the light scattered; the scattered light is then transmitted through the inner layer, and what the human eye sees The brightness of the inner layer is relatively balanced, and there is no obvious light group; other optical device structures can only scatter the light of the light source, and can evenly irradiate the reading medium, which is a reasonable optical path structure. So that no matter how the angle angle and direction angle change, the brightness of the eye-catching light remains unchanged.

The isotropic lighting device generally has a U-shaped structure. The size of the length, width and height of the real object and this example can be set according to the actual use environment. The overall structure is divided into three layers, the outermost layer is a wooden structure, and the outer surface of the wooden structure is coated with textured paint, which makes the lighting device and the reading desk coordinated and beautiful.

Paste light reflective aluminum foil material on the inner surface of the wooden structure, so that the light can be reflected after shining on the aluminum foil. The lamp is installed at the red position on the upper edge of the wooden structure. The lamp is a halogen incandescent lamp, which is small in size, light in weight, long in life and continuous in spectrum. The middle layer and the inner layer are light-transmitting and opaque acrylic boards. The acrylic boards are made into a U shape and placed in the trapezoidal groove of the wooden structure. Acrylic panels have the properties of light transmission and astigmatism at the same time.

When the light is irradiated or reflected by the aluminum foil onto the acrylic board in the middle layer, the acrylic board in the middle layer transmits, scatters and diffuses the light. Blobs of light caused by lights. The light scattered and diffused by the acrylic plate in the middle layer shines on the acrylic plate in the inner layer, and the acrylic plate in the inner layer transmits, scatters and diffuses the light again. The light rays are isotropic.

The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. It should be pointed out that for those of ordinary skill in the art, they can also do Several improvements and modifications are made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims (4)

1. An isotropic reading lighting device, characterized in that it comprises: a light-emitting device that illuminates the reading medium on the reading medium, and divides the area on the reading medium into a plurality of tiny areas, and in each tiny area (100), with The midpoint of the tiny area is the origin to construct a three-dimensional Cartesian coordinate, the normal direction of the reading interface is the z-axis, and the two perpendicular lines on the reading interface are the x-axis and the other is the y-axis; the eye-catching rays of the tiny area (101 ), the projection of the incident ray on the xy plane is a projection line (102), the angle between the incident ray and the z-axis is an angle angle, and the angle between the projection line and the x-axis is a direction angle; A plurality of low-power light sources are scattered and linearly arranged on the upper edge of any parallel plane above the reading medium or evenly distributed on the front and left and right sides of any parallel plane above the reading medium. There are optical elements, so that no matter how the angle angle and direction angle change, the brightness of the eye-catching light remains unchanged. 2. The isotropic reading lighting device according to claim 1, wherein the optical element comprises three layers, including an outer layer, a middle layer and an inner layer, and the light source is placed between the outer layer and the middle layer , the outer layer uses opaque reflective material with diffuse reflection characteristics to reflect the light from the light source; the middle layer and the inner layer are transparent materials with scattering characteristics, the reflected light and the incident light of the light source are transmitted through the middle layer, so that the direction of the light Scattered; Scattered light is transmitted through the inner layer. 3. The isotropic reading lighting device according to claim 2, characterized in that, the isotropic lighting device is generally a U-shaped structure, the outermost layer is a wooden structure, and the inner surface of the wooden structure is pasted Lightweight reflective aluminum foil material, which makes the light reflect when it shines on the aluminum foil. The middle layer and the inner layer are light-transmitting and opaque acrylic plates. The acrylic plate is made into a U shape. Reflected by the aluminum foil onto the acrylic board in the middle layer, the acrylic board in the middle layer transmits, scatters and diffuses the light, and the light scattered and diffused by the acrylic board in the middle layer shines on the acrylic board in the inner layer, which is opposite The light is transmitted, scattered and diffused again, and the light that hits the reading medium is isotropic. 4. The isotropic reading lighting device according to claim 3, characterized in that the distance between the lamp and the acrylic plate in the middle layer is 5-10 mm.