JP2001174878A - Camera finder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To distinctly observe photographing data together with a subject image and to easily assemble an optical display unit for displaying photographing data in a camera finder equipped with a finder optical system separately from a photographing optical system. SOLUTION: Subject image light made incident from objective lenses 11 to 14 is reflected by 1st, 2nd and 3rd reflection mirrors 15, 16 and 17, and the subject image light reflected in a horizontal direction by the 3rd reflection mirror 17 is formed into an image on a finder screen 19. Then, the image forming light is reflected by a half mirror 20 and guided to an eyepiece lens 21, and the photographing data light of the optical display unit 22 is transmitted through the half mirror 20 and guided to the eyepiece lens 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finder for a camera having a finder optical system separately from a photographing optical system.

[0002]

2. Description of the Related Art A camera finder is for observing a subject to be photographed in advance as a subject image before photographing. However, a recent camera has a shutter speed, an aperture value, In many cases, various photographing data such as a strobe mark and an exposure correction mark can be visually recognized by a finder.

[0003] Such a camera finder has a configuration in which image light of a subject passing through an objective lens is formed on a finder screen, and the formed light is guided to an eyepiece lens. For data, finders
A liquid crystal display section for photographing data is provided in a part of the screen, and the photographing data light of the liquid crystal display section is led to an eyepiece lens, or data using a light emitting element such as an LED. There is a configuration in which a data display is arranged near the periphery of a finder screen, and photographic data light of the data display is guided to an eyepiece lens.

[0004]

The photographed data is displayed in small characters or patterns on the offset portion of the finder field frame. For this reason, there is a problem that a finder provided with a liquid crystal display section has low data display clarity and is difficult to see.

Further, a finder provided with a data display using a light emitting element such as an LED can be visually recognized as clear data. However, the finder is merely provided near the periphery of the finder screen. Space is required for disposing the vessel.

In particular, in a compact camera, since the periphery of the finder screen is narrow, it is difficult to provide a space for incorporating a data display, which is an important problem in downsizing the camera.

[0007] In view of the above-mentioned circumstances, the present invention provides an LE
A camera finder provided with a data display using a light-emitting element such as D so that the photographed data can be clearly viewed together with the subject image and that the data display can be easily incorporated. -To propose.

[0008]

In order to achieve the above object, according to the present invention, a finder is provided separately from a photographing optical system.
An optical system for guiding an imaging light of a subject image, which is formed on a finder screen through an objective lens, through a half mirror, to a finder of a camera having an optical system, to guide the light to an eyepiece lens; And the photographing data light
There is proposed a camera finder characterized by comprising optical display means of photographing data for transmitting / reflecting a humor and making it incident on an eyepiece lens.

[0009]

In the finder according to the present invention, the image forming light of the subject image formed on the finder screen is reflected by the half mirror and guided to the eyepiece lens. The photographing data light displayed by the optical display means passes through the above-mentioned half mirror and is guided to the eyepiece lens.

As a result, the subject image and the photographed data can be viewed by looking through the eyepiece lens. According to the present invention, the display means of the photographing data can be arranged in the finder, so that the problem of the built-in space of the display means can be solved and the LED can be used.
Since it can be configured as a display means using a light emitting element such as the above, it can be visually recognized as clear photographing data.

It is to be noted that the half mirror has the same finder as a configuration in which the imaging light of the subject image is transmitted and the photographic data light of the display means is reflected and guided to the eyepiece lens.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a finder optical system, FIG. 2 is a side view of the optical system, and FIG. 3 is a plan view of the optical system. This optical system is provided as a camera finder provided separately from the photographing optical system.

In these drawings, reference numerals 11 to 14 denote lenses forming an objective lens, and the lenses 12 and 13 move as shown by a two-dot chain line in conjunction with zooming of the camera.
It is configured to change the size of a finder-field image.

Reference numerals 15 and 16 denote first and second reflection mirrors disposed at upper and lower positions behind the objective lenses 11 to 14, respectively. The first reflection mirror 15 is a subject image light incident from the objective lenses 11 to 14. Is reflected upward, and the second reflection mirror 16 is
The subject image light reflected by the reflection mirror 15 is received, and the subject image light is reflected forward (to the right in FIG. 2) in parallel with the optical path L1 of the objective lenses 11 to 12.

Reference numeral 17 denotes a third reflection mirror disposed directly above the objective lenses 11 to 14, which receives the subject image light reflected by the second reflection mirror 16, and transfers the subject image light in the horizontal direction. (Left direction in FIGS. 1 and 3).

Reference numerals 18 and 19 denote a light guide lens and a finder screen (target plate) provided on the reflection optical path L2 of the third reflection mirror 17. Finder screen 19
Is used to form a subject image. As shown in FIG. 4, the inside of the photographing range frame 19a is transparent or translucent, and the outside is opaque (for example, a black surface).

Further, inside the photographing range frame 19a, a close-up photographing range frame 19b and an auto caster target 19 are provided.
c and 9d are drawn. The target 19c is a multi-auto focus, and 19d is a spot auto-focus.
It is the target of the scum.

Reference numeral 20 denotes a reflection optical path L2 of the third reflection mirror 17.
Provided at the position of intersection P of the light path L3 and the light path L3.
The half mirror 20 receives the image forming light of the subject image formed on the finder screen 19 and reflects the image forming light toward an eyepiece lens (eyepiece lens) 21.

Reference numeral 22 denotes an optical display for photographing data. The photographing data light displayed by the optical display 22 passes through the half mirror 20 and is guided to the eyepiece lens 21. The optical display 22 includes a display plate 23 for photographing data.
And a light emitting element such as an LED for illuminating the display plate 23. In addition, LED is installed in case 24,
The display panel 23 is mounted on the front side of the case 24.

The display panel 23 is, as shown in FIG.
A black plate having a window hole 23a having the same size as the photographing range frame 19a of the finder screen 19, and a shutter speed display 23 as photographing data on a black surface portion thereof.
b, Exposure correction mark 23c, focus display 23d, and strobe mark 23e are white (transparent or translucent)
I have.

The optical display 22 constructed as described above has a distance M from the intersection P of the reflected light path L2 and the finder-light path L3.
It is located at position 1. That is, the distance (M) corresponding to the distance M2 from the intersection P to the finder screen 19
1 = M2). (See FIG. 3) In order to correct the diopter difference between the center and the periphery of the optical axis, it is actually preferable that M1 <M2.

In addition, a lens 25 is provided in the finder optical path L3 together with the eyepiece lens 21, and this lens 25 forms a convex lens system together with the eyepiece lens 21.

That is, the above-mentioned finder optical system forms a convex lens system by the objective lenses 11 to 14 and the condenser lens 18 and a convex lens system by the eyepiece lens 21 and the lens 25, and views the image as an erect image. It is made visible.

In the finder optical system constructed as described above, the subject image light incident from the objective lenses 11 to 14 is reflected upward by the first reflection mirror 15 and is incident on the second reflection mirror 16. The subject image light reflected in the forward direction by the second reflection mirror 16 is reflected by the third reflection mirror 1
7 and is reflected in the horizontal direction by the third reflection mirror 17.

Thus, the subject image light reflected by the third reflection mirror 17 is condensed by the condensing lens 18 and is imaged on the finder screen 19. Thus, the image forming light of the subject imaged on the finder screen 19 is
Close-up shooting range frame 19a and auto caster target 1
The light is reflected by the half mirror 20 together with 9 c, 19 d, etc., and guided to the eyepiece lens 21.

The photographing data light displayed by the optical display passes through the half mirror 20 and is guided to the eyepiece lens 21. As a result, when the finder is viewed through the eyepiece lens 21, the photographed data can be viewed together with the subject image 26 as shown in FIG.

[0027]

As described above, according to the present invention, the image light of the subject image formed on the finder screen is reflected / transmitted by a half mirror and guided to an eyepiece lens.
Further, since the photographing data light displayed by the optical display means is transmitted / reflected through the half mirror and guided to the eyepiece lens, the image data is displayed by illumination light such as an LED. The photographed data is a camera finder that allows the user to clearly view the captured image together with the subject image.

Also, since the optical display means for photographing data can be arranged near the half mirror, it is not necessary to incorporate it in a narrow space around the finder screen. This is a camera finder extremely advantageous for downsizing the camera.

[Brief description of the drawings]

FIG. 1 is a front view of a finder-optical system showing an embodiment of the present invention.

FIG. 2 is a side view of the finder-optical system.

FIG. 3 is a plan view of the finder-optical system.

FIG. 4 is a view of a finder provided in the finder optical system.
It is a front view of a screen.

FIG. 5 is a front view showing a display plate provided on an optical display for photographing data provided in the above-mentioned finder optical system.

FIG. 6 is a diagram showing a subject image and photographing data that can be viewed by a finder.

[Explanation of symbols]

 11-14 Objective Lens 15 First Reflection Mirror 16 Second Reflection Mirror 17 Third Reflection Mirror 18 Condensing Lens 19 Finder Screen 20 Half Mirror 21 Eyepiece Lens 22 Optical Display

Claims (1)

[Claims] In a finder of a camera provided with a finder optical system separately from a photographing optical system, an imaging light of a subject image formed on a finder screen through an objective lens is reflected by a half mirror. Reflection and / or transmission
An optical system for guiding the lens to the lens, and an optical display means for photographing data for transmitting / reflecting the photographing data light through the half mirror and entering the eyepiece lens. Characteristic camera finder.