JPH052133U - SLR camera with built-in infrastructure - Google Patents

Abstract

(57) [Summary] [Objective] To provide a single-lens reflex camera in which the installation space for the auxiliary light projector is small and the auxiliary light projector can be used effectively. [Structure] An autofocus device, and a single-lens reflex camera reflex camera equipped with a built-in flash in which a light emitting unit is housed in a casing that is moved to a housed position and a projecting position by a pop-up mechanism, projecting contrast pattern light toward a subject The auxiliary light projector is provided adjacent to the light emitting unit in the casing, and the auxiliary light projector can project the contrast pattern light when the casing is in the protruding position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a single-lens reflex camera equipped with an automatic focus adjustment device, which is equipped with a built-in flash and an auxiliary light projector that provides contrast for distance measurement to an object at low illuminance and low contrast.

[0002]

[Prior art and its problems]

 In recent years, automation has progressed even in single-lens reflex cameras, and various types of cameras incorporating an automatic focusing device and a built-in flash have been proposed. The automatic focus adjustment device in this single-lens reflex camera often adopts a passive focus detection method such as a correlation method (phase difference detection method). However, if this method is used, when the illuminance of the subject is low, or If the subject has a low contrast like a white wall, sufficient output cannot be obtained and accurate distance measurement cannot be performed. In order to solve this problem, an auxiliary light projector that irradiates the subject with a contrast pattern (striped pattern) light has already been installed, and when the illuminance is low or the contrast is low, the auxiliary light projector irradiates the contrast pattern light for focusing. To obtain the necessary trust. However, the conventional auxiliary floodlight is provided separately from the built-in flash, and therefore, in a single-lens reflex camera whose space is limited, how to set up the space for the auxiliary floodlight has been a problem.

[0003]

[The purpose of the device]

 The present invention aims to provide a single-lens reflex camera in which the installation space for the auxiliary light projector is small and the effective use of the auxiliary light projector can be effectively made based on such awareness.

[Outline of the device]

The present invention is made by paying attention to the fact that the auxiliary floodlight is required in low illuminance and low contrast, while the built-in flash is mainly used in low illuminance. The feature is that an auxiliary floodlight is provided adjacent to the light emitting part of the built-in flash that is held at the position and the protruding position. In this way, the auxiliary floodlights are provided adjacent to the light emitting part, and the pop-up mechanism holds them in the storage position and the projecting position so that the storage space for the auxiliary floodlights can be easily secured, and at the same time when the illuminance is low Since they are used, they are easy to use, and when they are not used, they are held in the storage position, so that the appearance of the single-lens reflex camera can be made excellent.

[0005]

【Example】

 The present invention will be described below with reference to illustrated embodiments. FIG. 1 is a perspective view showing a main part of a light emitting part of a built-in flash according to an embodiment of the present invention, and FIG. 2 is a front view showing the built-in flash mounted on a single-lens reflex camera with an automatic focusing device. FIG. 3, FIG. 3 and FIG. 4 are cross-sectional views showing a main part of the pop-up mechanism of the built-in flash, which is vertically cut along a plane passing through the optical axis.

The casing 20 of the built-in flash of the present invention is divided into two housings 21a and 21b. One of the housings 21a has a flash F, and the other housing 21b has a distance measuring auxiliary projector S. There is. That is, a condenser lens 22 is attached to the front surface of the casing 21a, and a xenon tube (light emitter) 23 and a reflecting mirror 24 are attached to the rear thereof, and the casing 21b is integrated with the condenser lens 22 on the front face. A condensing lens 25 formed in the above is attached, and a projector for distance measurement 26 that emits a bright and dark stripe pattern is attached behind it. This casing 20 is attached to a storage chamber 16 formed in the penta-house 12 of the camera body 10 via a known pop-up mechanism, and is moved between the projecting position and the storage position. An example of the specific structure will be described with reference to FIGS. 3 and 4.

A penta prism 14 is housed in the penta house housing 12, and a housing chamber 16 for housing a casing 20 is provided in front of the upper portion of the penta prism 14. The casing 20 includes a top plate 27 that forms a closed appearance together with the pentahous housing 12 when the casing 20 is in a position where the casing 20 is stored.

A link mechanism for pop-up is provided between the left and right side plates 28 of the casing 20 and the wall surface of the storage chamber 16. The link mechanism has the same structure on the left and right sides, so only one will be described. Shafts 34 and 40 are fitted into holes 28a and 28b formed in the side plate 28, and a first lever 32 and a second lever 38 are rotatably supported by these shafts 34 and 40, respectively. .. The other ends of the first lever 32 and the second lever 38 are attached to the penta-house casing 12 in the storage chamber 16 via shafts 36 and 42, respectively, and constitute a pop-up mechanism of the casing 20 by a four-bar rotation chain. is doing. The shaft 36 pivotally supports the U-shaped first lever 32 in the vicinity of the bent portion. A torsion spring (not shown) is attached to the shaft 42 of the second lever 38, whereby the second lever 38 is rotationally biased in the counterclockwise direction in the drawing, that is, in the direction in which the casing 20 projects upward and forward. ..

Further, a locking lever 50 is rotatably supported on the shaft 42, and one end of the above-mentioned torsion spring is engaged with the shaft 42 and is constantly biased to rotate clockwise in the figure. Part of the contact is regulated by abutting against the inner wall of the storage chamber 16. The tip end of the locking lever 50 engages with the locking surface 32a of the first lever 32 when the casing 20 is in the storage position where the casing 20 is stored in the storage chamber 16, and the counterclockwise direction of the first lever 32 is detected. The rotation is blocked so that the casing 20 does not project due to the rotation biasing force of the torsion spring, that is, the casing 20 is held at the storage position. The engagement between the locking lever 50 and the locking surface 32a is released by displacing the locking lever 50 in a direction perpendicular to the paper surface by a release member (not shown) mounted on the side surface of the pentahouse 12. Be done.

Therefore, when the casing 20 is moved to the projecting position by the operation of the release member, the built-in flash having the above-described configuration causes the flash F and the auxiliary projector S to be simultaneously moved to the camera body as shown in FIGS. 1 and 3. Exposed to the outside of 10. In this state, preparation for light emission of the built-in flash xenon tube 23 is started, and preparation for light projection of the projector 26 is completed. When the photographer presses down the release button (not shown) of the camera body 10, the projector 26 is energized at the initial stage to emit contrast pattern light, and then a subject image is formed by the contrast pattern light reflected by the subject. Based on this, the subject distance (defocus amount) is detected in the camera body 10, and the focusing lens (not shown) is driven based on the distance measurement signal. When the photographer further presses the release button, the release is performed, the mirror is raised, the shutter curtain travels, and the xenon tube 23 emits light.

The above is a method of using the flash F and the auxiliary light projector S at the same time in low illuminance. Since this method is the most frequently used, the built-in flash of the present invention is convenient to use. However, it is of course possible to use only the auxiliary projector S when the contrast is low. In this case, a switch that does not activate the flash F even if the casing 20 is popped up may be provided.

In the present invention, the mechanism for popping up the casing 20 or its position does not matter. For example, it may be provided in the grip portion of the camera body 10 or the film rewinding portion. In this case, the pop-up mechanism may be a vertically moving type, and the flash F and the auxiliary light projector S may be vertically arranged.

[0013]

[Effect of the device]

 As is clear from the above description, in the present invention, the auxiliary light projector that emits the contrast pattern for distance measurement is provided adjacent to the built-in flash light emitter provided on the camera body via the pop-up mechanism. There is no need to provide a separate installation location for the auxiliary floodlight. In the case of a dark subject where sufficient contrast cannot be obtained, auxiliary light projection and flash for distance measurement are required at the same time, and both can be positioned at the protruding position at the same time with one touch, which is convenient.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a light emitting unit of a built-in flash according to an embodiment of the present invention.

FIG. 2 is a front view showing the built-in flash integrated with a single-lens reflex camera body with an automatic focusing device.

FIG. 3 is a cross-sectional view showing a main part of the built-in flash housed state of the camera body taken along a plane passing through an optical axis.

FIG. 4 is a cross-sectional view showing a main part of the built-in flash protruding state.

[Explanation of symbols]

 F Flash S Auxiliary light projector 12 Pentahouse housing 14 Penta prism 16 Storage room 20 Casing 21a Housing (for flash) 21b Housing (for auxiliary light projector) 22 Condensing lens 23 Xenon tube (light emitter) 24 Reflector 25 Condensing Lens 26 Floodlight

Claims (1)

[Claims for utility model registration] 1. A single-lens reflex camera equipped with an autofocus device and a built-in flash having a light-emitting portion provided in a casing that is moved to a storage position and a protruding position by a pop-up mechanism, An auxiliary light projector for projecting a contrast pattern light toward the light source is provided in the casing adjacent to the light emitting portion, and the auxiliary light projector is configured to project the contrast pattern light when the casing is in the protruding position. A single-lens reflex camera equipped with a built-in flash.