JPH01293331A - Fully automatic camera red-eye prevention device - Google Patents

Abstract

PURPOSE:To obtain auxiliary light for red-eye prevention and auxiliary light for automatic focusing by the same light emitting device by stopping down luminous flux at the time of the auxiliary light for automatic focusing, and putting the auxiliary light emitting device in defocusing operation from the focus position of an optical system and widening light distribution at the time of the auxiliary light for red-eye prevention. CONSTITUTION:When an auxiliary light lamp 1 is used for the automatic focusing auxiliary light of the camera, a part to be image-formed on a line connecting thee points A-C for automatic focusing is arranged at a lighting position corresponding to a finder image and a filament image is projected on the periphery in a slightly out-of-focus state. Then when the auxiliary light lamp 1 is used for the red-eye preventive auxiliary light for a subject, a condenser lens 3 moves through the operation of a motor 6 with a signal from a CPU, an image connecting thee points A-C is defocused at the lighting position corresponding to the finder image, and a beltlike lighting zone is formed in the center of an picture plane, so that its peripheral weak lighting illuminates the large part of the picture plane. Consequently, the auxiliary light for automatic focusing and the auxiliary light for red-eye prevention are obtained by the same light emitting device.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a red-eye prevention device for a fully automatic camera used in flash photography.

<Conventional technology> Conventionally, in order to prevent red-eye in flash photography,
A technique for narrowing down the pupil of a subject using auxiliary light is known from Japanese Patent Publication No. 58-48088.

Additionally, many TTL type autofocus cameras add an auxiliary light to passive autofocus to enable distance measurement in dark places, and older cameras used contrast detection passive autofocus. But it was adopted.

<Problems to be Solved by the Invention> By the way, the red-eye prevention auxiliary light illumination and the autofocus auxiliary light, which have very similar functions, have not been performed using the same light source.

This is due to the difference in the nature of the red-eye prevention fill light, which requires light to reach most parts of the subject, whereas autofocus distance measurement requires illumination of only a small area. This is thought to be because the lamp had the disadvantage of having to consume too much electrical energy to be used as auxiliary light to prevent red-eye.

However, in recent years, the performance requirements for both passive autofocus systems are becoming more consistent, such that they are only really needed on the telephoto side of zoom cameras, and it has become necessary to expand the autofocus auxiliary light just a little. It has now reached the point where it can be used as an auxiliary light to prevent red-eye.

SUMMARY OF THE INVENTION In view of the problems of the prior art described above, it is an object of the present invention to provide a red-eye prevention device for a fully automatic camera in which red-eye prevention auxiliary light can be provided by the same light emitting device as autofocus auxiliary light.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides a flash device, an auxiliary light device for autofocus distance measurement, and an auxiliary light illumination system for autofocusing a decoy image in a dark place. In a fully automatic camera equipped with a distance measuring device capable of distance measurement, the auxiliary light device is provided with a zoom means for changing the irradiation range, and the auxiliary light is emitted toward the subject prior to flash photography to prevent red-eye. In order to prevent this, the illumination angle is made wider than when using the illumination auxiliary light for autofocus distance measurement.

Effect> In order to use the same auxiliary light emitting device as the auxiliary light for autofocus distance measurement to use the auxiliary light for red-eye prevention during flash photography, the luminous flux should be narrowed down as much as possible when using the auxiliary light for autofocus using the zoom means. When using the auxiliary light to prevent red-eye, the auxiliary light emitting device is defocused from the focus position of the optical system to widen the light distribution, making it possible to perform both functions as auxiliary light.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 5.

In FIGS. 1 and 2, 1 is an auxiliary light lamp, and a filament 1b made of tungsten wire or the like is placed inside a glass tube 1a.
is provided, and the filament 1b is arranged so as to be at the focal point of an optical system composed of a reflecting surface 2 and a condensing lens 3.

Reference numeral 4 denotes a lens drive unit which holds the condenser lens 3 located in front of the auxiliary light lamp 1 and is driven by a motor 6 via a gear 5 meshing with the rack portion 4a of the condenser lens. 3 back and forth, the image of the filament 1b of the auxiliary light lamp 1 can be defocused.

As shown in FIG. 3, the auxiliary light optical system including the auxiliary light lamp 1 has a filament 1b of the auxiliary light lamp 1 on the side of the bottle-shaped lens 8 of the camera body 7, tilted at a predetermined angle from the camera. It's laid out. This matches the inclination of the three autofocus distance measurement points with respect to the camera body 7.

FIG. 4 is a block diagram of an electric circuit for controlling the operation of the camera, in which the CPU 11 includes an auxiliary light emitting circuit 12, an autofocus circuit 13. Auxiliary light zooming motor drive circuit 1
4 and a flash circuit 15 are connected to each other for control.

In this embodiment with the above configuration, first, when the auxiliary light lamp 1 is used as an autofocus auxiliary light of the camera during distance measurement by the release operation, the illumination corresponding to the finder image is as shown in FIG. 5a. A strongly focused portion is located on the line connecting the three autofocus points A, B, and C, and a faintly blurred filament image is projected around it.

Next, for flash photography operation, the auxiliary light lamp 1 is turned on.
When used as a red-eye prevention auxiliary light for the subject, C
The condenser lens 3 is moved by the operation of the motor 6 in response to a signal from the PU 11, and the illumination position corresponding to the finder image is set to A as shown in FIG.

The line connecting the three points B and C is defocused, forming a band-shaped illumination zone in the center of the screen, and the weak illumination around it illuminates a large portion of the screen.

In this way, the light with the intensity necessary as an auxiliary light for autofocus is obtained during distance measurement, and when the flash is in the shadow, the eyes of the subject photographed by the camera are stimulated enough to focus on the camera. It also functions as a red-eye prevention light that has the physical effect of narrowing the pupil of the subject.

In addition, if the camera of this example is equipped with an electronic self-timer, displaying the self-timer using an auxiliary light device (continuously lit for 1.5 seconds at most) will help prevent red-eye. It is valid. In addition, when redoing autofocus distance measurement, perform autofocus remeasurement and m shadow lens 1 illt [l] 2 seconds before moving, and display that autofocus is complete after defocusing the condensing lens 3. Red-eye can be prevented by turning on the light continuously for 1.5 seconds as a self-timer display.

FIG. 6 shows another embodiment of the invention.

In this embodiment, the auxiliary light lamp 21 is provided with a filament 21bIfi in the glass tube 21a, as in the previous embodiment, and is fixedly installed in the camera body (not shown).
The lens drive member 24 holding the condensing lens 23 located in front of the condenser lens 24a1. : The auxiliary light lamp 21 is arranged so as to be movable in the optical axis direction by a guide bin 31 in the camera body to which it is fitted. It is set at a position corresponding to the focal length of the condenser lens 23, and a vertically bent portion 24b is formed at its right end.

Further, the release lever 26 is rotatably supported by a shaft 26a and urged clockwise by a spring 28, and has a shutter button 27 at one end, and the other end is provided with the lens driving member 24 standing. It is designed to be able to come into contact with the bent portion 24b, and push the vertical bent portion 24b to the right when the release is rotated.

Further, 29 is a switch that is turned on when the release lever 26 is rotated in the first stage to perform autofocus distance measurement and light metering for automatic exposure, and 30 is a switch that is turned on when the release lever 26 is rotated in the second stage. Vertical bent portion 24 of the lens driving member 24
This is a switch that is turned on when b is pressed and lights up the auxiliary light lamp 21.

In this embodiment with the above configuration, the shutter button 27
When pressed, the switch 29 is turned on by the first rotation of the release lever 26, and autofocus distance measurement and automatic exposure metering are performed by lighting the auxiliary light lamp 21.The second rotation of the release lever 26 turns on the switch 29. Vertical bent portion 24b of lens drive member 24
Press to turn on the switch 30 and turn on the auxiliary light lamp 2 again.
1 is turned on and the condenser lens 23 is set to the defocus position of the auxiliary light lamp 21 by the movement of the lens drive member 24.

Then, after the required time has elapsed, a photographing operation of the camera accompanied by flash light emission is performed.

In this way, the filament image of the auxiliary light lamp 21, which is focused only by the condenser lens 23, is formed during autofocus distance measurement as shown in FIG.

This is similar to the red-eye prevention defocus shown in the diagram, and can be used to suit each purpose.

In addition, in Honjitsu FM @, since the red-eye prevention light emission is effective even in the final stage of self-timer operation, it is linked to the self-timer that temporarily locks the lens drive member 24 by a mechanical mechanism (not shown), and an indication that the self-timer is in operation is displayed. Using an auxiliary light device is effective in preventing red-eye.

In each of the above embodiments, the condensing lens is a single lens, but if it is a bifocal two-body lens, a motor or movement mechanism for moving the lens can be made unnecessary.

<Effects of the Invention> As explained above, the present invention provides auxiliary light for autofocus and auxiliary light for red-eye prevention using the same light emitting device, emits light with slightly different light distribution, and achieves each purpose. Since it can be used as a light source that suits the space, it has the effect of increasing space efficiency and easily performing both functions.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of the essential parts of an 8-position red-eye prevention system of a fully automatic camera according to an embodiment of the present invention, Fig. 2 is a sectional view of its auxiliary light lamp, Fig. 3 is a front view of the camera, and Fig. The figure is a block diagram of the operating circuit of the camera, and Figure 5 is an explanatory diagram of the illumination state of the auxiliary light in the viewfinder image. The figure is a diagram showing the main part of another embodiment of the present invention. 1.21... Auxiliary light lamp, 2... Reflective surface, 3゜2
3... Condenser lens, 4.24... Lens drive member,
6...Motor, 7...Camera body, 8...Photographing lens, 25.28...Spring, 26...Release lever-127...Shutter button, 29.30...Switch. Fig. 1 Fig. 2 City Fig. 3 Fig. 4 One Fig. 5 (a) Fig. 6 21 °Auxiliary light j〉F. 23: Komaru response 24: L) Su-ni-1 first attachment 1 rule 26: Shi-IJ-Swish-no-ichi

Claims (1)

[Claims] 1. In a fully automatic camera that has a flash device, an auxiliary light device for autofocus distance measurement, and a distance measurement device that enables autofocus distance measurement in dark places by illuminating the auxiliary light, the auxiliary light device A zoom means for changing the irradiation range is provided, and the auxiliary light is emitted toward the subject prior to flash photography, so that the irradiation angle is wider than that for autofocus distance measurement illumination auxiliary light to prevent red eyes. A fully automatic camera red-eye prevention device characterized by: