SU669313A1 - Pin-hole camera - Google Patents

Description

(54) OBSCUR CAMERA

I

The invention relates to an optical instrument making and is intended to obtain an actual direct image of luminous objects, both small and large angular sizes, and can also be used in devices for sighting and orientation.

Known optical devices built on the pinhole camera pinhole, containing the light-transmitting hole and the screen 1.

However, with such devices, it is impossible to obtain a direct image of objects without an additional reversing system.

A pinhole camera is also known, comprising a housing with a hole, wrapping the P1 system and a screen 2.

A disadvantage of this device is the impossibility of wrapping the image within large field of view angles.

The aim of the invention is to increase the field of view.

This is achieved by the fact that, in the device, the wrapping system is made in the form of two compatible ones with flat surfaces.

With a beam-splitting coating of plano-convex lenses, the thickness of which is equal to half the radius of their spherical surfaces with reflective butting applied on them, in which flat and spherical surfaces are translucent, the centers of which are aligned with the optical axis of the lenses, convexo-concave a lens with a focal surface that coincides with the focal surface of the spherical mirror of the first lens, and the concave surface of the convex-concave lens is aligned with the spherical light transmitting surface adkoy, and the center of curvature of the convex surface lies on a spherical surface the optical axis of the second lens.

The drawing shows a diagram of the device.

The pinhole camera contains two combined flat-convex lenses 1, 2 with spherical mirror surfaces and light-transmitting areas, a convex-concave lens 3, whose focal surface coincides with the focal surface