JPH02293725A - Plural simultaneous imaging type optical device - Google Patents

Abstract

PURPOSE:To allow the viewing of both of a partially magnified projection and overall reduced projection with a sufficient light quantity and sharp image quality by condensing the light transmitted through the same sample by a common lens, then bisecting the light by a beam splitter and introducing the split light beams to a macroprojecting system and a reduction image pickup system. CONSTITUTION:The light from the light source 1 is made incident through a heat absorbing plate 2, a cold mirror 3 and a condenser lens 4 on the transmission sample 5, such as photographic negative and the transmitted ray thereof is introduced via the common projecting lens 14 and a mirror 15 to the beam splitter 16, by which the ray is bisected to two luminous fluxes. The 1st luminous flux 17 is macroprojected onto a transmission screen 19 as it is or after the flux is reflected by a 2nd mirror 18. The 2nd luminous flux 20 is reflected by a reflection screen 21 and is then further reflected by a 2nd beam splitter 22. This luminous flux is condensed by an image pickup lens 23 and is subjected to the reduction image pickup by an image sensor 24. The simultaneous viewing of the partially magnified image of, for example, a microfilm and the overall reduced image thereof by associating both the images is possible in this way.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical device including a projector that optically projects an image, and more specifically, it is capable of simultaneously forming a plurality of images from the same sample. The present invention relates to an optical device, and more specifically, to an optical device that can simultaneously form a plurality of images of significantly different sizes from the same sample, all with clear image quality.

[Prior Art] A conventionally well-known projector consists of an optical system that forms a single image from a single sample, and the need for a projector that simultaneously forms multiple images from the same sample has not been found in the past. It does not exist because it was not done.

However, theoretically, as shown in FIG.
For the optical system that forms an image on the screen 7 via the enlarged projection lens 6, there is a transmission sample 5 and the projection lens 6.
If a beam splitter 8 is inserted between the 2
It is easy to imagine that the second enlarged projection image will be formed on the screen 10 of.

[Problems to be Solved by the Invention] However, in the above method, the sizes of the two images are limited to a certain degree of difference, and for example, as shown in FIG. When it is desired to minimize the size of the image so that it can be input to the image sensor 12, a problem arises in that the amount of light is insufficient. That is, the distance positions of the condenser lens 6 in the enlargement projection optical system and the condenser lens 11 in the reduction projection optical system from the beam splitter 8 are set so that the former is close and the latter is far in inverse proportion to the enlargement/contraction. As a result, the amount of light taken into the imaging lens l1 set far from the beam splitter 8 is limited to B, and most of the amount of light A is dissipated to the outside of the front imaging lens l1. Therefore, the illumination conditions incident on the image sensor 12 are extremely poor, and the periphery of the screen becomes dark, making it unusable.

As an idea to eliminate this problem, for example, if a diffuser plate 13 is inserted in the position immediately in front of the light source l, the image sensor 1
Although it is possible to slightly increase the amount of light at the periphery of the image No. 2, the brightness on the screen 7 decreases by that amount, which is also not practical.

As described above, when it is desired to read, inspect, or measure the shape or dimensions of a minute object to be measured, the present invention first takes a photograph of the object with a camera and creates a photographic negative, that is, a transmission sample. 5, and the minute object to be measured,
One screen 7 performs a partially enlarged projection, and the other image sensor 12 simultaneously performs a reduced projection of the entire object to be measured. When you want to proceed with a study in a restrained state, you can simultaneously perform two types of projection from the same sample, namely, a partially enlarged projection and a completely reduced projection, both with clear image quality with sufficient light intensity. The object of the present invention is to provide an optical device obtained by the present invention.

[Means for Solving the Problems J] The present invention, as a means for achieving the above-mentioned object, transmits a first light beam from a light source, passes through a transmission sample, a projection lens, and forms an image on a screen, by connecting the projection lens and the screen. At least two beams with a mirror and a beam splitter interposed between them.
An enlarged projection optical system is provided to reflect the beam twice, and the second beam transmitted from the mirror through the BIM blitter is reflected by a reflection screen installed at a position conjugate with the screen, and the reflected second beam is A reduction imaging optical system is provided which causes the beam to be reflected at least once through a second beam splitter and then forms an image on an imaging section through an imaging lens.

[For production]

The first light beam in the enlargement projection optical system and the second light beam in the reduction imaging optical system are reflected in the same direction by a common mirror after passing through the same sample and the projection lens.
The light is split into two by a beam splitter.

The first beam of the two divided beams is refracted by the beam splitter and is enlarged and projected onto the screen.

The second light flux that has passed through the beam splitter is reflected by utilizing the wide diffusivity of the reflective screen, and after being reflected by the second beam splitter, the second beam passes through the imaging lens and is imaged in a reduced size at the imaging section.

Since the projection lens is common, the same partial image of the same sample is projected onto the reflection screen as on the screen of the enlarged projection optical system.

Since a reflective screen is used in the reduction imaging optical system, there is a difference between the angle of incidence of the second light beam on the surface of the screen and the angle of reflection from that surface, causing it to be diffused and the directivity to be significantly weakened. Since the second light beam is focused on the imaging lens and reaches the imaging section, there is no difference in brightness between the center and the periphery of the imaging section, and an image with uniform brightness can be obtained.

〔Example〕

A specific embodiment of the present invention will be described in detail below with reference to FIG.

First, to explain the optical system that is common to both the enlargement projection optical system and the reduction imaging optical system, for example, light from a light source 1 passes through a heat absorption plate 2, a cold mirror, and a transmission sample 5 such as a photographic negative. 3, enters via condenser lens 4,
After the transmitted light beam is focused by a common projection lens 14,
It is reflected by a common mirror 15, and the thus reflected common light beam reaches a beam splitter 16.

The common beam reaching the beam splitter 16 is then divided into 2
One is reflected there and becomes the first light beam l7,
The other light beam passes therethrough and becomes a second light beam 20.

The first light beam l7 can be sent as is or to the second mirror 18.
The light is further reflected and enlarged and projected onto the transmission screen 19.

The second light beam 20 is reflected by a reflective screen 2l, the reflected second light beam 20 is further reflected by a second beam splitter 22, and the reflected second light beam is condensed by an imaging lens 23. Then, a reduced image is captured by an imaging unit, for example, an image sensor 24.

This invention is not limited to the above embodiments, but extends to all modifications within the scope of the claims.

[Effects of the Invention] As described in detail above, in the present invention, the light transmitted through the same sample 5 is focused by the common lens 14, and then divided into two parts by the beam splitter 16, and the resulting reflected light is That is, while the first light beam 17 is enlarged and projected onto the transmission screen l9, the transmitted light of the beam splitter 16, that is, the second light beam 20, is applied to the reflection screen 2l to be diffused and the directivity is weakened. After passing through the beam splitter 22, the light is condensed by the lens 23 and is reduced to an imaging unit, such as an image sensor 24, so that the image forming unit in the reduction imaging optical system can be reduced without reducing the illuminance of the transmission screen 19 in the enlargement projection optical system. 24, uniform brightness can be obtained over the center and periphery. Therefore, it is convenient to use it, for example, to simultaneously project or capture a partially enlarged read image of a microfilm and its overall reduced monitor image, and to examine the two in relation to each other.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a specific embodiment of a multiple simultaneous imaging type optical device according to the present invention, and FIG. 2 is an explanatory diagram showing a specific embodiment of a multiple simultaneous imaging type optical device according to the present invention. FIG. FIG. 2 is an explanatory diagram of a theoretically obvious multiple simultaneous imaging type optical device. 1...Light source, 2...Heat absorption plate, 3...Cold mirror 4...Condenser lens, 5...Transmission sample, 6...First enlarged projection optical system projection lens, 7...
- Screen of the first enlarged projection optical system, 8... Beam splitter 9... Projection lens of the second enlarged projection optical system, X...
- Setting position of the projection lens 9, A... Amount of light focused by the projection lens 9, 10.
- Screen of the second enlargement projection optical system, Y... Setting position of the screen IO, 11... Projection lens of the reduction projection optical system, B... Amount of light condensed by the projection lens 1l, 12... Image sensor (imaging position of reduction projection optical system) l3... Diffusion plate, l4... Common projection lens, l5... Common mirror 16... Beam splitter 17... ...First light beam, 18...Second mirror l9...Screen, for example, transmission screen 20...Second light beam, 21...Reflection screen, 22...Second light beam Beam splitter 23...imaging lens, 24...imaging unit, for example, image sensor,

Claims (3)

[Claims] (1) Enlargement in which a first beam of light, which is formed from a light source, passes through a transmitted sample, a projection lens, and forms an image on a screen, is reflected at least twice by interposing a mirror and a beam splitter between the projection lens and the screen. a projection optical system; and a second beam that passes through the beam splitter from the mirror.
A second beam of light is reflected by a reflective screen installed at a position conjugate to the screen, and the reflected second beam of light is reflected at least once through a second beam splitter and then focused through an imaging lens. A multiple simultaneous imaging type optical device comprising: a reduction imaging optical system that forms an image on an image section; (2) The multiple simultaneous imaging type optical device according to claim 1, wherein the screen of the enlarged projection optical system is a transmission screen. (3) The multiple simultaneous imaging type optical device according to claim 1, wherein the imaging section of the reduction imaging optical system is an image sensor.