JP3512490B2 - Multiple exposure photography equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple exposure photographing apparatus for sequentially displaying a plurality of color image data of a color image on a monochrome CRT and exposing each color image to photograph the color image.

[0002]

2. Description of the Related Art Conventionally, a videoscope having a solid-state image pickup device built into its tip, or a video camera having a solid-state image pickup device which can be attached to an eyepiece of a fiberscope,
Endoscopic video systems capable of obtaining scope images are widely used.

In such an endoscopic video system, as a method for obtaining a high quality color hard copy from a display, a color image is displayed on a color CRT,
A method of directly photographing a CRT tube surface on a film is adopted.

When the color CRT screen is directly photographed in this way, the size of the color elements of R, G, and B cannot be ignored, and it is provided especially for improving the contrast of the color CRT screen. When a black matrix pattern or the like is photographed as a fixed pattern and the photographed image is stretched, there is a drawback that the image becomes difficult to see.

Therefore, by using a high-resolution monochrome disc play and exposing three times through the R, G, and B filters, the R, G, and B colors are time-divisionally photographed to obtain a high-quality color image. Multiple-exposure imagers have been proposed.

[0006]

However, in general, a multiple-exposure photographing apparatus must be driven so as to switch filters intermittently in a plurality of times in order to photograph one frame.

However, at the time of taking an endoscopic picture, since a large number of frames are taken in a short time, it is necessary to switch the filters at a high speed. However, in the conventional multiple exposure photographing apparatus, the filters are intermittently used. In many cases, a stepping motor is used for mechanical driving, and when the stepping motor is used to rotate the filter at high speed, there is a problem that a great amount of vibration and noise are generated.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a multiple-exposure photographing apparatus capable of performing multiple-exposure photographing of a high-quality color image with low vibration and low noise. .

[0009]

According to the multiple exposure photographing apparatus of the present invention, a color image in which one screen is formed from a plurality of color images which are luminance images for each of a plurality of color components is used. The image display means for sequentially displaying the image display means, and a mount member that is provided so as to face the image display surface of the image display means, and on which a camera that shoots the color image displayed on the image display means on a photographic film is mounted. A filter unit having a plurality of color filters corresponding to the plurality of color components of at least the plurality of color images, and a plurality of the plurality of color images fixed by the mount member and displayed by the image display unit. The filter driving means is provided which selectively inserts the color filter corresponding to a color component into an optical path connecting the image display means and the camera. By fixing means to said mounting member, it makes it possible to multiple exposure shooting color images of high image quality and low noise low vibration.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 relate to a first embodiment of the present invention. FIG. 1 is a block diagram showing a configuration of an endoscope system equipped with an image photographing device which is a multiple exposure photographing device, and FIG. 3 is an external view showing the configuration of the image capturing apparatus of FIG. 3, FIG. 3 is an explanatory view illustrating the gear and the output gear of FIG. 1, and FIG. 4 is a block diagram showing the detailed configuration of the image capturing apparatus of FIG.

As shown in FIG. 1, an endoscope system equipped with an image capturing apparatus 1 which is a multiple exposure image capturing apparatus of this embodiment has a slender and flexible structure which is inserted into a body cavity 2 to capture an image of an observation site. An electronic endoscope 3 provided with a solid-state image sensor, for example, a CCD or the like in the distal end portion thereof, a light source that supplies illumination light to the electronic endoscope 3, and a video processor that performs signal processing of an image pickup signal from the electronic endoscope 3. And a monitor 5 for displaying an observation site in the body cavity 2 by a video signal processed by the signal processing device 4, and the image capturing device included in the endoscope system. 1 is configured to perform multiple-exposure shooting by a camera 6 that is detachably attached to an observation site in the body cavity 2 by a video signal from the signal processing device 4 based on a freeze signal from the electronic endoscope 3, for example. Are

As shown in FIG. 2, the image capturing apparatus 1 constitutes a circuit for signal-processing a video signal of, for example, RGB separate signals from the signal processing apparatus 4 to generate an image signal for each color image data. A circuit board 10 and a monochrome CRT 11 (image display means) for sequentially displaying an image based on an image signal for each color image data from the circuit board 10.
And the images displayed on the monochrome CRT 11 are R, G, B
A rotary filter 12 (filter means) having an R filter 12r, a G filter 12g, a B filter 12b, and a viewing window 12a to be an image, a mount 14 for detachably connecting the camera 6 main body via a camera adapter 13, and a rotation. A motor 15 (filter driving means), which is a stepping motor for rotating the filter 12,
A gear 16 is provided on the outer periphery of the rotary filter 12, and an output gear 17 provided on the output shaft of the motor 15 is meshed with the gear 16 to drive the motor 15 based on a control signal from the circuit board 10. By driving, the R filter 12r, the G filter 12g, and the B filter 12b are sequentially switched in synchronization with the images sequentially displayed on the monochrome CRT 11.

As shown in FIG. 3A, the gear 16 and the output gear 17 on the outer periphery of the rotary filter 12 are, for example,
Since it is a helical gear, and the gear 16 and the output gear 17 mesh with each other with a twist angle, the impact of the teeth is small only in the axial component, and the noise level is lower than when using a spur gear. Since it is small and meshes, it can be driven at a higher speed than the conventional configuration in which the rotary filter is rotated by utilizing the friction of rubber. Further, compared to the conventional one in which the motor 15 and the rotary filter 12 are connected by a belt and rotated, a troublesome adjustment (tension (tension) adjustment, alignment (belt parallelism) adjustment) like a belt becomes unnecessary.

Although the rotating mechanism of the rotary filter 12 is composed of the gear 16 and the output gear 17, the present invention is not limited to this. As shown in FIG. 3B, the photographing optical path is on the rotary shaft of the rotary filter 12. The helical gear 16a at a position where
May be provided and the helical filter 16a may be rotated via the output gear 17 which is a helical gear of the motor 15 to rotate the rotary filter 12. In this case, it is possible to realize an image capturing device having a space in the vertical direction.

The image capturing device 1 will be described in more detail. As shown in FIG. 4, the image capturing device 1 includes an A / D converter 20 for A / D converting the video signal from the signal processing device 4.
And a frame memory 21 for storing the video data converted into a digital signal by the A / D converter 20, and a D / A converter for controlling the frame memory 21 and D / A converting the video data stored in the frame memory 21. 22 and the motor 14
By controlling the rotation of the rotary filter 12 by R,
The camera 6 is provided with a control circuit 23 for controlling the exposure time of the G and B color images, and the camera 6 transmits the light transmitted through the rotary filter 12 to the film 2 via the taking lens 24 in the camera adapter 13.
It is designed so that multiple exposures can be made to 5 and the images can be taken.

Further, in the camera 6, a camera control circuit 26 for controlling the shutter time and the like by the output from the control circuit 23 is provided, and the camera control circuit 26 causes the rotary filter 12 to display R, G, B color images. The shutter time is controlled in association with the exposure time of.

Further, the camera 6 is provided with a quick return mirror 27, a pentaprism 28, and a finder 29. When the quick return mirror 27 is in the position indicated by the solid line, it is in the non-shooting state, and the shooting lens 24 is attached. The luminous flux incident therethrough is reflected by the quick return mirror 27, passes through the pentaprism 28, and can be visually observed by the finder 29. At the time of non-shooting, the control circuit 23
Control is performed so that the viewing window 12a of the rotary filter 12 is stopped in the optical path, and the quick return mirror 27 is stopped at the solid line position via the camera control circuit 26.

Further, when the quick return mirror 27 is at the position of the broken line, it is during photographing, and the light flux incident through the photographing lens 24 forms an image on the film 25. At the time of this photographing, the control circuit 23 stops the quick return mirror 27 at the position indicated by the broken line via the camera control circuit 26, and then rotates the rotary filter 12 in the optical path in the order of R filter 12r → G filter 12g → B filter 12b. Stop, and in synchronization with this, the monochrome CRT 11 goes from R to G
The control is performed so that the images are displayed in the order of → B.

The mount 14 is attached to a mount base 31 (mount member) and serves as a reference surface to which the adapter 13 is attached. The mount surface is an important surface that forms an optical path, and not only the perpendicularity is required so that the optical path is in a straight line, but also an accurate distance to the film 25 surface must be maintained.

Therefore, the mount base 31 to which the mount 14 is attached is a solid member capable of maintaining a certain degree of accuracy, and further maintains the above accuracy even if some vibration or shock is applied. , The adapter 13 must be very solid so that the accuracy will not be affected even if an excessive force is applied by the user when the adapter 13 is attached or detached. Therefore, in this embodiment, the mount base 3
1 is made of, for example, aluminum die-cast, and has a large weight.

On the other hand, the rotary filter 12, the output gear 17,
The motor 15 and the iterators 32 and 3 that unitize them
3. The hashler 34 is unitized into one unit, and this unit is firmly fixed to the mount base 31 by the hashler 35.

In the image taking apparatus 1 of the present embodiment having such a configuration, when taking a picture with an endoscope, in order to reduce the pain of the patient, the picture taking is considerably completed in the shortest possible time. A large number of frames are continuously shot at high speed.

Therefore, the rotary filter 12 is also required to be driven at a high speed, and in multiple exposure photography, for example, R, G, and B three sheets must be switched at a high speed for each frame.
Since 5 is a stepping motor, when it is driven at a high speed, very large vibration and noise may be generated, which may destroy a quiet diagnostic environment. However, in the image capturing apparatus 1 of the present embodiment, the rotary filter 12 has a large mount base. Since it is attached to the unit 31 as a unit, it is possible to effectively absorb vibrations and noises and perform multiple exposure shooting of high-quality color images with low vibrations and low noises.

Next, the second embodiment will be described.

FIG. 5 is a block diagram showing the arrangement of an image capturing apparatus according to the second embodiment of the present invention. Since the second embodiment is almost the same as the first embodiment, only the different structure will be described.
The same components are designated by the same reference numerals and description thereof will be omitted.

As shown in FIG. 5, in the image photographing device 50 of the second embodiment, the monochrome CRT 11 is fixed to the CRT support base 51, and the CRT support base 51 is mounted on the mount base 3.
It is fixed on 1. Also, the motor 15 is
The ita 52 is directly attached to the mount base 31. The other structure is the same as that of the first embodiment.

In addition to the effects of the first embodiment, the image pickup device 50 of the present embodiment thus constructed has a monochrome CR.
Since it is unitized into one unit including T11, the focus (inclination) can be held more firmly.

By the way, the R filter 12r, the G filter 12g, and the B filter 12 provided in the rotary filter 12
b may be configured as shown in FIG. That is, R
Filter 12r, G filter 12g, B filter 12b
Are bonded to each other with a transparent adhesive in a sandwich shape in which a plastic color filter 62 is sandwiched between glass 61 (two sheets). Since it is a plastic color filter, it can be formed into a film, the thickness can be made constant, and the spectral transmittance can be stabilized. Also,
As it is protected by the glass 61, it is hard to get scratches,
The glass 61 has less dust adhesion due to static electricity than plastics, and has the effect of not being strongly deformed by temperature changes.

[Additional remarks] (Additional remark 1) The filter means has a filter holding part for holding the plurality of color filters, and the filter driving means drives the filter holding part. Item 6. The multiple-exposure photographing device according to Item 1.

(Additional Item 2) The filter holding portion is a disk rotatably held about a central axis, and the central axis of the disk is fixed to the mount member. The multiple-exposure photographing apparatus according to appendix 1, wherein the driving unit rotationally drives the filter holding unit.

(Additional Item 3) The filter holding portion of the disc has a helical gear portion on the outer periphery, and the filter driving means is fixed to the motor and the rotary shaft of the motor, and the helical gear portion of the filter holding means. The multiple-exposure photographing apparatus according to item 2, further comprising a helical gear that meshes with.

(Additional Item 4) The image display means is fixed to the mount member.
The multiple-exposure photographing device described in.

(Additional Item 5) The multiple-exposure photographing apparatus according to claim 1, wherein the mount member is made of aluminum die cast.

[0035]

As described above, according to the multiple-exposure photographing apparatus of the present invention, since the filter driving means is fixed to the mount member, the multiple-exposure photographing of a high-quality color image with low vibration and low noise is performed. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of an endoscope system equipped with an image capturing apparatus which is a multiple exposure capturing apparatus according to a first embodiment of the present invention.

FIG. 2 is an external view showing the configuration of the image capturing apparatus shown in FIG.

FIG. 3 is an explanatory diagram illustrating a gear and an output gear of FIG.

FIG. 4 is a block diagram showing a detailed configuration of the image capturing apparatus shown in FIG.

FIG. 5 is a configuration diagram showing a configuration of an image capturing apparatus which is a multiple exposure capturing apparatus according to a second embodiment of the present invention.

FIG. 6 is a configuration diagram showing a configuration of a modified example of a rotary filter.

[Explanation of symbols]

1 ... Image capturing device 3 ... Electronic endoscope 4 ... Signal processing device 5 ... Monitor 6 ... camera 10 ... Circuit board 11 ... Monochrome CRT 12 ... Rotary filter 12r ... R filter 12g ... G filter 12b ... B filter 12a ... Window for viewing 13 ... Camera adapter 14 ... Mount 15 ... Motor 16 ... Gear 17 ... Output gear 20 ... A / D converter 21 ... Frame memory 22 ... D / A converter 23 ... Control circuit 24 ... Shooting lens 25 ... Film 26 ... Camera control circuit 27 ... Quick return mirror 28 ... Penta prism 29 ... Finder 31 ... Mount base 32, 33 ... 34, 35 ... Hashira

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroko Oishi 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Shingo Kato 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industry Co., Ltd. (72) Inventor Shigeo Kiyohara 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industry Co., Ltd. (56) Reference JP 59-219088 (JP, A) SHO 60-107832 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03B 27/00-27/80 A61B 1/04 360 A61B 1/06

Claims (5)

(57) [Claims] 1. An image display unit for sequentially displaying a color image in which one screen is formed from a plurality of color images, which are luminance images of a plurality of color components, for the plurality of color images, and an image of the image display unit. A mount member which is provided so as to face the display surface, and on which a camera for photographing the color image displayed on the image display means on a photographing film is mounted; and a plurality of color components for at least the plurality of color images. A filter unit having a plurality of corresponding color filters; and the color filter fixed to the mount member and corresponding to the plurality of color components of the color image displayed by the image display unit, A multiple-exposure photographing apparatus, comprising: a filter driving unit that is selectively inserted in an optical path connecting the cameras. 2. The filter means and the filter drive
The means are unitized into one, and this unit
Claims characterized by being fixed to the mount member
Item 6. The multiple-exposure photographing device according to Item 1. 3. The filter means includes a plurality of colors.
It has a filter holding part for holding the filter, and the filter holding part is rotatably held around the central axis.
And the central axis of the disc is
It is fixed to a mount member.
1. The multiple-exposure photographing device described in 1. 4. The filter holding portion of the disc has a peripheral edge.
The filter driving means includes a motor and a rotation of the motor.
It is fixed to the shaft and meshes with the helical gear of the filter holder.
And a helical gear that performs
The multiple-exposure photographing device described. 5. The image display means is the mount member.
5. The device according to claim 1, which is fixed to
The multiple-exposure photographing device according to any one of the above.