JPH08297260A - Color separation optical system - Google Patents

Abstract

PURPOSE: To prevent a registration error from occurring because the temperature of a color separation optical system attached in the image pickup system of a color television camera gets high by generated heat from an image pickup element. CONSTITUTION: By providing recessed and projected fin shapes 13a and 13b on prism mount plates 12a and 12b integrally holding and fixing a prism block 11 constituting the color separation optical system on both end faces, the surface area of the optical system is increased and heat radiation efficiency is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color for interposing between an image pickup lens such as a color television camera and an image pickup means, for separating a light flux incident from the image pickup lens into an image on the image pickup means. The present invention relates to a decomposition optical system.

[0002]

2. Description of the Related Art Conventionally, in a color separation optical system used in a color television camera or the like, a plurality of prism blocks 1 are joined between the focal planes of an imaging lens 3 and three sets of imaging means 2 as shown in FIG. The color separation optical system is arranged. In order to hold and fix this color separation optical system to the mechanism system of the color television camera, as shown in FIG. 4, the prism block 1 is mounted on the prism mounting plate 4a provided with taps and positioning holes.
A method of directly bonding and fixing is generally used. Further, the prism mounting plate 4 of the prism block 1
In general, a prism mounting plate 4b made of the same material is adhered to the surface opposite to the surface to which a is adhered for the purpose of stabilizing registration. The prism mounting plates 4a and 4b are generally in the form of flat plates having a uniform plate thickness, except that they are provided with taps for holding and fixing and holes for positioning.

[0003]

However, in the above-mentioned conventional example, since the prism block 1 and the prism mounting plates 4a and 4b have different linear expansion coefficients, a registration error occurs due to a temperature change. In particular, in a color television camera in which the image pickup means 2 uses a solid-state image pickup device, the solid-state image pickup device is firmly fixed to the exit surface of the prism block 1 via a member. Therefore, the heat generated from the fixed image pickup device is conducted through the member, the temperature of the entire color separation optical system becomes high, and a registration error occurs. Furthermore, since a color television camera using a solid-state image sensor does not have a registration adjusting mechanism, a registration error due to the temperature increase of the entire color separation optical system has been a serious problem.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is an object of the present invention to provide a color separation optical system in which the heat of the color separation optical system is effectively and inexpensively discharged and the registration is stable.

[0005]

In order to achieve the above-mentioned object, the present invention is interposed between an imaging lens and an imaging means,
In a color separation optical system including a plurality of prism blocks for color-separating the light flux from the image pickup lens and a prism mounting plate for integrally holding and fixing the prism blocks, the prism mounting plate is provided with heat radiation It is provided with a fin shape. Further, as the fin shape of the prism mounting plate, an uneven shape may be formed, or a comb-shaped member may be joined.

[0006]

In the color separation optical system having the above construction, the surface area of the prism mounting plate is increased due to the fin shape formed by joining concave and convex shapes or comb-shaped members, and the heat radiation effect is improved. As a result, the color separation optical system, which has been heated to a high temperature by the heat generated by the image pickup means, is effectively cooled.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. In the figure, reference numeral 11 denotes a prism block including a plurality of prisms, which is interposed between an image pickup lens such as a color television camera (not shown) and an image pickup means. 1
Designated by 2a and 12b are prism mounting plates for integrally holding and fixing the prism block 11 on both end faces thereof, and the outer surfaces of the prism mounting plates are fin-shaped 13a and 13 having uneven shapes, respectively.
b is formed.

In this embodiment having the above-mentioned structure, the prism mounting plates 12a and 12b have a surface area increased due to the fin shape of the surface thereof, so that the heat radiation efficiency is improved.

FIG. 2 shows a second embodiment of the present invention. In the figure, reference numeral 21 denotes a prism block composed of a plurality of prisms, which is interposed between an image pickup lens such as a color television camera (not shown) and an image pickup means. 22a,
Reference numeral 22b denotes a flat prism mounting plate for integrally holding and fixing the prism block 21 on both end faces thereof, and comb-shaped fin-shaped members 23a and 23b on the outer peripheral end faces thereof, respectively.
Are joined.

In the present embodiment having the above-mentioned structure, the heat of the prism block 21 heated to a high temperature by the image pickup means is transferred to the fin-shaped members 23a and 23b from the prism mounting plates 22a and 22b, and the heat dissipation efficiency is also improved.

[0011]

As described above, the present invention effectively provides a color-separating optical system whose temperature is raised by the heat generated by the image pickup means by providing the prism mounting plate of the prism block forming as described above with the fin shape. It is possible to cool at low cost, and it is possible to suppress a registration error due to a temperature change, particularly a high temperature region, to a practically sufficient accuracy. Further, the fin shape can be easily formed at low cost by forming uneven shapes or joining comb-shaped members.

[Brief description of drawings]

FIG. 1 is a perspective view of a color separation optical system of Example 1 according to the present invention.

FIG. 2 is a perspective view of a color separation optical system according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a photographing system of a color television having a conventional color separation optical system.

FIG. 4 is a perspective view of the color separation optical system of the same.

[Explanation of symbols]

11, 21 ... Prism blocks, 12a, 12b, 2
2a, 22b ··· Prism mounting plate, 13 ··· Concavo-convex fin-shaped, 23 · · Comb-shaped fin-shaped member.

Claims (3)

[Claims] 1. An interposing device between an imaging lens and an imaging means,
In a color separation optical system including a plurality of prism blocks for color-separating the light flux from the image pickup lens and a prism mounting plate for integrally holding and fixing the prism blocks, the prism mounting plate is provided with heat radiation A color separation optical system characterized by having a fin shape. 2. The color separation optical system according to claim 1, wherein the prism mounting plate is formed in a concavo-convex shape to form a fin shape. 3. The color separation optical system according to claim 1, wherein a comb-shaped fin-shaped member is joined to the prism mounting plate.