JPH0714444U - Finder device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a viewfinder device that is easy to see and does not hinder the downsizing of a camera. In a finder device of a daylighting window type, a daylighting window 4 is arranged around a light projecting lens 3 of an autofocus device, a reticle 7 is arranged here, and a mirror 5 is further arranged.
A light source 9 of the autofocus device is arranged on the back surface of the light source, and a light passage portion 8 for securing an optical path from the light source is provided at the center of the mirror.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a daylighting window type finder device for a camera.

[0002]

[Prior art]

 As shown in FIG. 2, outside light is transmitted to the finder optical system through a viewfinder optical system having an objective lens 10 and an eyepiece lens 11 and a daylighting window 12 provided with a display 15 such as a reticle via a mirror 13 and a half mirror 14. A viewfinder device including a display optical system for making light incident is known as a daylighting window type viewfinder. This type of viewfinder has the advantage that the display is easy to see because it uses external light from the viewfinder optical system, which is independent of the viewfinder optical system, when displaying a reticle, etc., but it requires an independent viewlight window. Therefore, it does not meet the recent demand for compact cameras, and albada type viewfinders as shown in Fig. 3 are now the mainstream.

The finder of this system has a structure in which a reflecting lens 22 for reflecting the display 23 arranged on the eyepiece lens is provided between the objective lens 20 and the eyepiece lens 21 and contributes to downsizing of the camera. Have advantages.

[0004]

[Problems to be solved by the device]

 However, this type of viewfinder is less visible than the above-mentioned daylighting window type viewfinder, and of course the reflection lens is placed in the optical path, so there is less freedom in design, and further dust is not found in the viewfinder. If it does occur, it is enlarged and it causes a noticeable problem.

On the other hand, while the current cameras are desired to be made compact, all the functions are automated, so that the attention of important persons is focused on an accurate and easy-to-find viewfinder capable of accurately cutting a photographed image, particularly With the spread of macro photography and panoramic photography functions, the importance of displaying reticles and target frames has been reconfirmed, and the above-mentioned alvada-type viewfinder has a problem that it cannot fully meet these demands.

In view of the above problems of the prior art, it is an object of the present invention to provide a viewfinder device which is easy to visually recognize and which has the contradictory problem of not hindering downsizing of a camera.

[0007]

[Means for Solving the Problems]

 The idea was to incorporate a daylighting window type finder device into a camera without hindering its compactness, and to find a finder optical system having an objective lens and an eyepiece and a daylighting window with a display. In a finder device consisting of a display optical system that allows outside light to enter the finder optical system through a mirror and a half mirror, a daylighting window is arranged around the projection lens of the autofocus device, and the reticle is located here. And a light source of the autofocus device on the back surface of the mirror, and a light passage portion for securing an optical path from the light source at the center of the mirror.

[0008]

[Action]

 Therefore, according to this invention, the following effects are brought about. First, since the finder optical system having the objective lens and the eyepiece has the same structure as the conventional finder window type finder, there is an effect that an optical system peculiar to the daylighting window type having a high degree of freedom in design can be realized.

Next, with respect to the display optical system, the reticle arranged in the daylighting window is reflected by the mirror in the direction of the half mirror, so that the observer can see it clearly.

In the above case, since the lighting window is arranged around the projection lens of the autofocus device which should be provided in the camera, it is not necessary to separately arrange it, and since the reticle is also arranged here, the autofocus is provided. There is an effect that the display of a necessary and sufficient range can be secured without impairing the function of the device.

On the other hand, regarding the light projecting optical system of the autofocus device, the light source is arranged on the back surface of the mirror, but since the light source passage portion is provided at the center of the mirror, it is aimed at the light projecting lens. As a result, the light can be projected without any trouble.

Further, as to the target frame, as will be described later in the embodiment, the LED for displaying the target frame is arranged on the rear surface of the mirror by utilizing the passage portion at the center of the mirror, and from this, the half mirror The effect is that it becomes possible to project light toward.

[0013]

【Example】

 An embodiment of the finder device of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view showing an optical system of the finder device of the present invention. In the figure, reference numeral 1 is an objective lens, and reference numeral 2 is an eyepiece lens, both of which constitute a finder optical system, and a half mirror 6 for interposing a reticle described below with a finder image is interposed in this optical system.

Next, reference numeral 4 in the drawing denotes a daylighting window of the display optical system. Here, the daylighting window is integrated with the light projecting lens 3 of the autofocus device on the same optical axis. In this embodiment, a collar portion is integrally formed around a light projecting lens with a synthetic resin to form a daylighting window 4, and a reticle 7 is arranged on this collar portion.

The reticle 7 may be applied by printing, but may also be applied by using a liquid crystal, and in this case, the reticle can be changed or switched electrically easily.

Reference numeral 5 in the drawing is a mirror for reflecting the reticle toward the half mirror 6. As described above, the daylighting window 4 in which the reticle is arranged is integrated with the light projecting lens 3 of the autofocus device on the same optical axis. Therefore, the light source 9 of the autofocus device is arranged in the direction of this mirror, but the light passage portion 8 is provided at the center of this mirror 5 and the light source 9 is provided on the back surface thereof, so that the mirror 5 is made to be the light source 9. I try not to block the optical path.

Reference numeral 10 in the drawing denotes a light source for displaying a target frame, and an LED is used in this embodiment, but it goes without saying that it is not limited to this. The light source 10 is arranged on the back surface of the mirror 5, but by utilizing the passage portion 8 at the center of the mirror, an optical path toward the half mirror 6 is secured.

In the figure, reference numeral 24 is a light-receiving lens of the autofocus device, and reference numeral 25 is a light-receiving element.

[Effect of device]

 The present invention configured as described above has the following unique effects. A finder with a highly visible display and a high degree of freedom in the design of the optical system has been realized, and a highly commercial camera that meets the needs of consumers can be obtained.

Since the projection lens of the autofocus device which the camera should have is shared with the lighting window and the space for this projection optical path is also shared with the space for the optical path to the mirror, the size of the camera can be reduced. It is possible to realize the above-mentioned high-performance viewfinder without changing it, which contributes to downsizing of the camera.

For the same reason, since the existing space is used, no special molding is required. If the lighting window and the light projecting lens are integrally molded, the number of parts and the process of assembling do not increase, and a low cost is achieved. It is possible to realize the high-performance viewfinder mentioned above at a cost.

As described in the section of the operation, even if the lighting window is shared with the light projecting lens, the function of the autofocus device is not impaired at all.

Since the mirror has a passage portion, the LED can be used for forming the target frame without blocking the optical path as described in the section of the embodiment, and the passage portion itself is used for projecting light. Since it is shared with the optical path, it is possible to form an effective target frame at low cost without increasing the space, the number of parts, and the assembly process.

As a result of the above, if a light source such as an LED is used, it is possible to arbitrarily select the color of the target frame based on its characteristics, and it is also possible to erase it by stopping the energization. It can be used as various messages to the user to improve the operability of the camera.

For the same reason as above, the position adjustment and size adjustment of the target frame can be performed independently of the reticle, so that the productivity in the camera manufacturing process can be improved.

Since the reticle is arranged around the light projecting lens, it is possible to use the liquid crystal for displaying the reticle as described in the embodiment section, and it is possible to electrically and easily change or switch the reticle. It is possible to improve the viewability of the viewfinder of a camera equipped with a macro shooting function or a panoramic shooting function.

[Brief description of drawings]

FIG. 1 is a sectional view of an optical system of a finder device according to the present invention.

FIG. 2 is a cross-sectional view of an optical system of a conventional daylighting window type finder device.

FIG. 3 is a sectional view of an optical system of a prior art albada type finder device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Objective lens 2 Eyepiece lens 3 Emitting lens 4 Lighting window 5 Mirror 6 Half mirror 7 Reticle 8 Passing section 9 Light source (for autofocus device) 10 Light source (for target frame display) 24 Light receiving lens 25 Light receiving element

Claims (4)

[Scope of utility model registration request] 1. A finder device comprising a finder optical system having an objective lens and an eyepiece lens, and a display optical system for allowing outside light to enter the finder optical system through a mirror and a half mirror from a daylighting window in which a display is arranged, A lighting window is placed around the projection lens of the autofocus device, a reticle is placed here, and the light source of the autofocus device is placed on the back surface of the mirror.
A finder device characterized in that a light passage portion for securing an optical path from this light source is provided at the center of the mirror. 2. The finder device according to claim 1, wherein the lighting window and the light projecting lens are integrated on the same optical axis. 3. The finder device according to claim 1, wherein a collar portion is integrally formed around the light projecting lens, and a reticle is arranged on the collar portion. 4. The finder device according to claim 1, wherein a light source for displaying a target frame is arranged on the back surface of the mirror, and the light is projected from the passage portion at the center of the mirror toward the half mirror.