JP2000122123A - Finder for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the size of a camera small and also make an image in a finder clear-to-view by forming a part of a finder unit of the member of a range-finding unit. SOLUTION: An infrared ray projection part 31 and a light receiving part 32 are coupled by range-finding unit bridges 301 and 302, so that a range-finding unit 3 is formed. The unit 3 is combined with the finder unit 2 so as to form the finder 1. The unit bridge 301 is directly arranged as the ceiling plate of an objective lens 21 and variable lenses 22 and 23 except a fixed lens 24 incorporated in a finder base 20. The unit bridge 302 is provided with the diaphragm 33 of the lens 21 being the 1st lens of an objective system nearest to the object side of the finder unit 2. Unnecessary light 28 is prevented from being made incident on the lens 21 by the diaphragm 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a finder for an autofocus camera.

[0002]

2. Description of the Related Art A viewfinder of a conventional autofocus camera includes a distance measuring unit having an autofocus function and a viewfinder unit for determining a composition of a subject and for determining which subject to focus on, and the like. Rather than thinking of both as organic things together,
It was thought and arranged as a separate unit.

The objective lens of the finder optical system is
It was arranged as a finder lens as it was.

[0004]

As described above, since the distance measuring unit and the finder unit are considered and arranged as separate units, the arrangement space of each unit is secured as it is. As a result, the size of the viewfinder must be large,
Therefore, there is a problem that the size of the camera becomes large.

The objective lens of the finder optical system is
Since the finder lens is arranged as it is, there is a problem that the image of the finder cannot be seen clearly due to internal reflection when unnecessary light enters.

The above problem will be described with reference to FIG.

FIGS. 1A and 1B are views for explaining a finder of a conventional autofocus camera. FIG. 1A is a front view of the finder, and FIG. 1B is a cross-sectional view taken along the line XX of FIG.

In FIG. 1, on a ceiling plate of the finder unit 2, a distance measuring unit bridge 301 connecting an infrared light projecting unit 31 and a light receiving unit 32 is arranged. That is, in the finder of the conventional example, the distance measuring unit bridge 301 connecting the infrared light projecting unit 31 and the light receiving unit 32 is disposed so as to overlap the ceiling plate of the finder unit 2. For this reason, the height of the finder 1 is increased by the thickness of the distance measuring unit bridge 301, and the height of the finder 1 from the bottom of the finder unit 2 is increased.
Is h1.

When unnecessary light 28 passing through the objective lens 21 is incident on the objective lens 21 as the first lens of the objective system of the finder unit 2, irregularly reflected light 28 due to internal reflection is generated.
1, 282, 283, etc. enter the eye together with the image of the finder, so that the image of the finder cannot be seen clearly.

The present invention has been made to solve the above problems. That is, it is an object of the present invention to provide a camera finder that can reduce the size of the camera and make the image of the finder clear.

[0011]

The object of the present invention is achieved by adopting the following constitution.

That is, in a camera finder provided with a distance measuring unit and a finder unit, a member of the distance measuring unit forms a part of the finder unit.

A finder for a camera, wherein a member of the distance measuring unit which forms a part of the finder unit forms a ceiling plate of the finder unit.

A finder for a camera, wherein a member of the distance measuring unit forming a part of the finder unit forms an aperture of a first objective lens closest to an object side of the finder unit.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a camera viewfinder according to the present invention will be described in detail with reference to FIGS. 2 and 3. However, the present invention is not limited to the embodiments described below. Absent.

FIG. 2 is a view of a finder according to the present embodiment.
(A) is a front view of the finder, (b) is Y in FIG.
FIG. 4 is a cross-sectional view taken along arrow Y. FIG. 3 is a plan view of the finder according to the present embodiment.

2 and 3, the finder 1 of the present embodiment is a finder of an auto-focus camera, as in the description of the conventional example of FIG.
The light receiving unit 32 and the light receiving unit 32 are connected by a distance measuring unit bridge 301 as shown in the figure to form a distance measuring unit 3. The distance measuring unit bridge 301 is also a member of the distance measuring unit 3 that forms a part of the finder unit 2. The distance measuring unit 3 includes the finder unit 2
Are combined as shown to form the finder 1 of the present embodiment.

The finder base 20 incorporates an objective lens 21, which is the first objective lens closest to the object side of the finder unit 2, and variable-power lenses 22, 23, and a fixed lens 24. The middle objective lens 21 and the fixed lens 24 are fixed without moving, and the two variable power lenses 22 and 23 move in the optical axis direction to increase the magnification of the finder, for example, from wide angle to standard to telephoto. In response to a change in the focal length of the photographing lens.

A prism 26 is arranged next to the fixed lens 24 as shown in the figure, and a reflecting mirror 27 and an eyepiece 25 are incorporated in the finder base 20. The user can view the finder image as a real image through the eyepiece 25. You can see it.

The distance measuring unit bridge 301 is directly disposed as a ceiling plate of the objective lens 21 and the variable power lenses 22 and 23 except for the fixed lens 24 incorporated in the finder base 20, as shown in the figure. . Therefore, the height of the finder 1 is not added to the thickness of the distance measuring unit bridge 301, and the height of the finder 1 from the bottom surface of the finder unit 2 is h2. This height h
In No. 2, the thickness of the ceiling plate of the finder unit 2 can be made lower than at least the height h1 of the conventional example. Therefore, the size of the camera can be reduced accordingly.

Similarly, on the front side of the finder 1, the infrared light projecting unit 31 and the light receiving unit 32 are connected to each other, and a ranging unit bridge 302 orthogonal to the ranging unit bridge 301 is provided.
Are provided in the distance measuring unit 3. The distance measuring unit bridge 302 is also a member of the distance measuring unit 3 which forms a part of the finder unit 2.

The distance measurement unit bridge 302 is provided with an aperture 33 of the objective lens 21 which is the first objective lens closest to the object side of the finder unit 2.
By providing the stop 33, the unnecessary light 28 is prevented from entering the objective lens 21, so that diffusely reflected light is not generated unlike the conventional example. Therefore, the diffusely reflected light does not enter the eye together with the finder image, so that the finder image can be seen clearly.

[0023]

According to the present invention, there is provided a camera finder which can reduce the size of the camera and make the image of the finder visible.

[Brief description of the drawings]

FIG. 1 is a front view and a cross-sectional view illustrating a conventional finder.

FIG. 2 is a front view and a cross-sectional view illustrating a finder according to the embodiment.

FIG. 3 is a plan view of the finder according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Finder 2 Finder unit 20 Finder base 21 Objective lens 28 Unnecessary light 3 Distance measuring unit 31 Infrared light projecting part 32 Light receiving part 33 Aperture 301, 302 Distance measuring unit bridge

Claims (3)

[Claims] 1. A finder for a camera having a distance measuring unit and a finder unit, wherein a member of the distance measuring unit forms a part of the finder unit. 2. The camera viewfinder according to claim 1, wherein a member of said distance measuring unit forming a part of said viewfinder unit forms a ceiling plate of said viewfinder unit. 3. The finder unit according to claim 1, wherein a member of the distance measurement unit forming a part of the finder unit forms an aperture of the first objective lens closest to the object side of the finder unit. 3. The viewfinder of the camera according to 2.