JPH09106002A - Camera with magnetic recording unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always detect the correct object illuminating light source information by magnetically recording the information on the kind of illuminating light sources while projection to a photographic object is not performed to the photographic film. SOLUTION: A light source detecting resin CM detects information on the toner of color of illuminating light of object. The circuit of the light source detecting resin CM comprises a photo-electric element having the spectral sensitivity to red, green and blue, respectively and outputs information on the spectral component inciding on the photo-electric element. The information on the spectral characteristics of illuminating light of the object by the above can be obtained, and further a control circuit PRS conducts work for presuming the kind of illuminating light of the object from the above information. As a result of the work, it is possible to discriminate whether an object is illuminated by natural light, it is illuminated by fluorescent light, or it is illuminated by tungsten light. The control circuit PRS outputs the above information to the magnetic information control circuit HCK and magnetic information is recorded on the film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a magnetic recording section.

[0002]

2. Description of the Related Art In recent years, a photographic film is provided with a magnetic recording section, and data is recorded in the magnetic recording section by a camera and the information is read out and used in the subsequent development or printing process. A photographic system is proposed (for example, USP 4,864,33).
2).

Further, in such a photographic system, the camera detects the type of light source illuminating the object, records this information in the magnetic recording portion of the film at the time of photographing, and reads this information at the time of printing to print. There is known a technique to be used for color balance adjustment. Such a technique is disclosed, for example, in Japanese Patent Laid-Open No. 6-
It is described in JP-A-175187 and JP-A-7-114092.

[0004]

The purpose of the camera to detect the type of the light source illuminating the subject for the purpose of adjusting the color balance of the print as in the above example is to illuminate the subject. Is to detect information about the color shade of the existing light source. For example, by detecting that the subject you are about to shoot is illuminated by a fluorescent lamp with a strong green tint, this information is magnetically recorded so that the subject will not be printed in a color that is biased toward green. The color balance is adjusted.

By the way, the camera is equipped with a means for projecting light onto the subject for autofocusing, a light emitting means for alleviating the red-eye effect, and the like, and the camera illuminates the subject. When trying to detect the information about the color of the light source, if the light emitting means or the light emitting means is illuminated, the color of the light source illuminating the subject is mixed with the light color of the light emitting means or the light emitting means. It is not possible to detect information about the correct color of the subject illumination light, or to estimate the correct subject illumination light source.

[0006]

According to the present invention as set forth in claim 1, there is provided a means for projecting light on an object to be photographed, a light source detecting means for discriminating the type of illumination light source of the object to be photographed, and an image on a photographing film. Magnetic recording means for magnetically recording information is provided, and the information of the illumination light source of the photographing subject is inputted from the light source detecting means in a state where the light projecting means is not projecting light, and the photographing subject is based on the inputted information. By providing a camera having control means for controlling the magnetic recording means so as to magnetically record information on the type of the illumination light source on the photographic film after determining the type of the illumination light source, Is excluded and correct subject illumination light source information is detected.

According to a sixth aspect of the present invention, the measurement and measurement operation of the light source by the light source detection means is completed by the light projection means within the shooting preparation period before the start of shooting or by the light projection means during exposure. By performing at a time before the start of magnetic recording at the time of film winding after the end of light exposure to the end of exposure, avoid the time of projecting light by the projecting means to the subject during the shooting sequence,
In addition, the present invention provides a camera capable of preventing the shooting sequence from being prolonged due to the light source detection operation.

[0008]

1 is a perspective view showing the structure of a film cartridge, a film and its peripheral portion in a camera embodying the present invention. In the figure, CT is a film cartridge, K is an opening / closing member for opening and closing the light-shielding lid at the film exit of the film cartridge by rotating, and DD is an information display showing information such as film type, sensitivity, and the number of shots by a black and white pattern. Element,
The FK is a fork for rotating the shaft of the cartridge to feed or rewind the film. Incidentally, the information display member DD is a disc-shaped member similar to the technique described in Japanese Patent Laid-Open No. 5-313233 and is a fork FK.
Is rotated by the rotation of the disk, and the stop position of the disk also represents the filming state of the film, that is, whether the film is unexposed, partially exposed or fully exposed.

Information reading means S20 and S21 are constituted by, for example, a photo reflector, and are for reading the black and white pattern while rotating the information display member DD.

SW40 and SW41 are film cartridge presence / absence detection switch contacts that are short-circuited when the film cartridge CT is loaded in the camera, KT is an opening / closing drive member for driving the opening / closing member K, and SW30 and SW31 are light-shielding. A light-shielding lid opening / closing detection switch contact piece for detecting the opening / closing of the lid, and when the opening / closing drive member KT drives the opening / closing member K and is in the open position of the light-shielding lid, by the conduction portion SW32 on the opening / closing drive member KT. It is detected that the light blocking lid is driven to the open position by being short-circuited.

FM is a film, T is a film FM
The upper magnetic tracks, P0 to P3, are perforations for positioning the photographing screen. S10 and S
Reference numeral 11 is a sensor for detecting the movement and stop position of the film by monitoring the perforations P0 to P3, and is constituted by, for example, a photo reflector. H is a magnetic head for reading and writing magnetic information on the magnetic track T, and PA is a magnetic head H.
It is a pad for pressing the magnetic track T on the film FM against. M1 is a first motor for winding and rewinding the film, and G1 is a motor M1.
, A gear train for connecting the fork FK and the spool for winding the film, M2 is a second motor for driving the opening / closing drive member KT, and G2 is a connection between the motor M2 and the opening / closing drive member KT. It is a gear train for.

FIG. 2 shows the film FM and the photoelectric sensor S.
10 is a diagram showing the relationship between 10 and S11 and the magnetic head H. FIG. In the figure, Aa is a screen that has already been shot, Ab is a screen that is shot next at the aperture position, and Ac is a screen that is shot next. As described above, T is the magnetic track on the film FM, and Sa is the shooting screen A.
This is an area in which photographing information is written by the magnetic head H when a is wound up. Sb is an area in which shooting information is written by the magnetic head H when the shooting screen Ab is rolled up after the shooting is performed. X is the film winding direction. The photoelectric sensors S10 and S11 are arranged so as to be close to the perforations P2 and P1 representing the current photographed screen and inside the screen when the film is stopped at the normal stop position, as shown in the figure.

FIG. 3 shows an electric circuit configuration of a camera embodying the present invention. In the figure, PRS is a control circuit for controlling the operation sequence of the entire camera, and is composed of, for example, a microcomputer. Note that a description of a specific operation sequence of the control circuit PRS will be given later.

MDR1 is a motor driver for driving the first motor M1 described with reference to FIG. 1, and is controlled by the control circuit PRS to drive the motor M1 for forward rotation, reverse rotation, braking and the like. The output of S1 is input to the control circuit PRS by the sensors S10 and S11 described in FIG. 1, and the control circuit PRS can know the movement of the film and its stop position by monitoring the output of these sensors. . HCK is a magnetic information control circuit that outputs write information to the magnetic head H described in FIG. 1 and amplifies read information from the magnetic head H. The control circuit PRS outputs necessary information to the magnetic information control circuit HCK when recording magnetic information on the film, and monitors the output of the magnetic information control circuit HCK when reading magnetic information from the film. The output of S2 is input to the control circuit PRS by the sensors S20 and S21 described in FIG. 1, and the control circuit PRS can know the type of film and the photographing state by monitoring the output of these sensors. MDR2 is the second motor M2 described in FIG.
Is a motor driver for driving the control circuit P
Controlled by RS, the motor M2 is energized for forward rotation, reverse rotation, braking, and the like. SWRL1 is a switch that is turned on by the first stroke of the release switch of the camera, and is input to the control circuit PRS. SWRL2 is a switch that is turned on by the second stroke of the release switch of the camera, and is input to the control circuit PRS. SW2 is a switch for detecting opening / closing of the lid of the film cartridge storage chamber (not shown), and is input to the control circuit PRS. S
W3 is a shield cover opening / closing detection switch contact piece S described in FIG.
The switch is composed of W30 and SW31 and the conducting portion SW32, and is input to the control circuit PRS as a light-shielding lid open / close detection switch. SW4 is the cartridge presence / absence detection switch contact pieces SW40 and SW described in FIG.
41 and is input to the control circuit PRS as a cartridge presence / absence detection switch. SWMR is a switch for detecting the down of the main mirror of the camera, and is input to the control circuit PRS.

The LM is a photometric means composed of, for example, a phototransistor, and its output is the control circuit PR.
Input to S. The control circuit PRS can obtain the brightness information of the subject by reading the output of the photometric means LM. DM is a distance measuring means or a focus detecting means constituted by, for example, a CCD line sensor, and its output is input to the control circuit PRS. The control circuit PRS can obtain information on the distance to the subject or defocus by reading the output of the distance measuring means or the focus detecting means DM. SH is an exposure control unit including, for example, a shutter and a diaphragm, and exposes the film based on a signal output by the control circuit PRS. The LDR is a lens driving unit including, for example, a motor, a drive circuit thereof, a transmission mechanism, and the like, and drives the lens based on a signal output by the control circuit PRS. D
SP is a display unit composed of, for example, an LED or LCD, and performs various displays based on the signal output by the control circuit PRS.

CM is a light source detecting means for detecting the information on the color tone of the illuminating light of the subject, and is a control circuit PRS.
By reading the output of the light source detection means CM, it is possible to detect information about the color tone of the subject illumination light. ST
Is a strobe device for irradiating the subject at the time of shooting, RL
Is a light emitting means for alleviating the red-eye phenomenon at the time of stroboscopic photography, and AUX is a light emitting means for performing pattern light projection on the subject for autofocusing when the illuminance of the subject is not sufficient.

FIG. 4 is a sectional view showing an optical arrangement of a single-lens reflex camera to which the present invention is applied. In FIG. 4, LNS is a taking lens, QRM is a main mirror, and FSCR.
The N focusing plate, DSP is the display means described in FIG. 3, PP is a pentaprism, and FPLN is a film surface. The following is arranged at the bottom of the camera. SM is a sub-mirror, MSK is a field mask, ICF is an infrared cut filter, FLDL is field lens, RM1 and RM2.
Are first and second reflecting mirrors, SHMSK is a light-shielding mask, DP is a diaphragm, AFL is a secondary imaging lens, and AFM.
Is a mirror and SNS is a sensor. The configuration from the sub-mirror SM to the sensor SNS described above represents the optical configuration of the distance measuring means or the focus detecting means DM shown in FIG. Further, EPL is an eyepiece lens, LM is the distance measuring means LM described in FIG. 3, CSNS is a sensor for light source detection, C
SL is an optical means for guiding light to the sensor CSNS and directly transmits external light to the sensor CSNS without passing through a photographing lens. The sensor CSNS for detecting the light source and the optical means CS
L is the light source detection means CM described in FIG.

Next, a specific operation sequence of the control circuit PRS will be described with reference to the flowcharts shown in FIG. The power switch (not shown) is turned on and the control circuit PR
When S becomes operable, the control circuit PRS operates step by step from (1) in FIG.

(1) The control circuit PRS initializes the memory and ports.

(2) Cartridge presence / absence detection switch SW
Check condition 4. If it is off, the cartridge is absent, that is, the film cartridge is not inserted in the camera, so that the camera waits for the film cartridge to be inserted. When the film cartridge is inserted into the camera and SW4 is turned on, the process proceeds to (3).

(3) Check the state of the switch SW2 for detecting the opening / closing of the lid of the film cartridge storage chamber. If it is off, the lid of the film cartridge storage chamber is still open, so wait for it to be closed. When the lid of the film cartridge storage chamber is closed and SW2 is turned on, the process proceeds to (4).

(4) A control signal is output to the motor driver MDR2 to start driving the second motor M2.

(5) Switch SW3 indicating that the light-blocking lid is opened by inputting the information of the light-blocking lid opening / closing detection switch SW3
Wait to detect the ON state of.

(6) When the ON state of the switch SW3 is detected, a control signal is output to the motor driver MDR2 to stop the driving of the second motor M2.

(7) A control signal is output to the motor driver MDR1 to start driving the first motor M1. Thereby, the rotation of the information display member DD is started.

(8) The signal from the sensor S2 is input and the information displayed by the information display member DD is read. As a result, information on the type of film and the exposure state can be obtained.

(9) When the reading of information from the information display member DD is completed, a control signal is output to the motor driver MDR1 to stop the driving of the first motor M1.

(10) Next, a mechanism (not shown) is switched so that the film can be loaded by driving the motor M1.

(11) A control signal is output to the motor driver MDR1 to start driving the first motor M1.
This starts the film loading.

(12) The output of the sensor S1 is monitored to wait for the film to be fed to the first shooting frame position. When it is detected that the image has been sent to the position of the first frame, the process proceeds to (13).

(13) A control signal is output to the motor driver MDR1 to stop the driving of the first motor M1.
This completes film loading.

When (13) in FIG. 5 is completed, (1 in FIG.
Proceed to 4).

(14) First release switch of camera
It is checked whether or not the stroke switch SWRL1 is turned on. If it is on, proceed to step (15).

(15) Information on the brightness of the subject is input from the photometric means LM.

(16) It is checked whether or not the inputted information on the brightness of the object is equal to or more than a predetermined value which enables distance measurement or focus detection. If it is equal to or larger than the predetermined value, the process proceeds to (18), but if not, the process proceeds to (17).

(17) Since the subject brightness is not sufficient, the light projecting means AUX is turned on to illuminate the subject. This enables distance measurement or focus detection even in a situation where the brightness of the subject is not sufficient.

(18) Information on the distance or defocus of the object is input from the distance measuring means or the focus detecting means DM.

(19) The light projecting means AUX is turned on. If the brightness of the subject is sufficient and step (17) is not executed, this step is meaningless, but if step (17) is executed, it is turned on in step (17). The projecting means AUX is turned off in this step.

(20) An output signal is output to the lens driving means LDR so that the lens is brought into the in-focus state based on the inputted information regarding the distance or defocus of the subject.

(21) Information on the brightness of the subject is input from the photometric means LM.

(22) It is checked whether or not the inputted information relating to the luminance of the subject is equal to or larger than a predetermined value at which the stroboscopic light emission is unnecessary. If it is not less than the predetermined value, the process proceeds to (23). In this step, the determination result as to whether or not the information regarding the brightness of the subject is equal to or larger than a predetermined value at which the stroboscopic light emission is unnecessary is required in a later step and is stored in its own memory.

(23) A shutter speed and an aperture value that give an appropriate exposure are determined on the basis of the inputted information relating to the brightness of the object.

(24) The determined shutter speed and aperture value are output to the display means DSP for display.

(25) Second release switch of camera
Check whether the stroke switch SWRL2 is turned on. If it is off, return to (14).

When the subject brightness is less than the predetermined value in the step (22), the process proceeds to (26).

(26) Since the brightness of the subject is not sufficient, the shutter speed and aperture value for photographing using a strobe are determined.

(27) Control output is made to the strobe device ST to prepare for light emission.

After that, the procedure proceeds to the step (24) to display information and proceeds to (25). When SWRL2 is turned on in step (25), the process proceeds to (28) in FIG.

(28) The information relating to the brightness of the subject stored in the step (22) is referred to the result of judgment as to whether or not the stroboscopic light emission is unnecessary and is below the predetermined value. If so, proceed to (29).

(29) The light emitting means RL is caused to emit light in order to mitigate the red-eye phenomenon that tends to occur when performing stroboscopic photography.

(30) Wait until the predetermined light emitting time of the light emitting means RL elapses.

(31) The light emission of the light emitting means RL is stopped.

(32) The mirror drive mechanism (not shown) is controlled to raise the main mirror.

If the result of determination in step (28) is greater than the predetermined value, stroboscopic photography is not performed, so steps (29) to (31) are not executed (32).
Proceed to.

(33) The exposure control means S based on the aperture value determined in the step (23) or (26).
H is controlled to narrow down the aperture.

(34) The exposure control means SH is controlled to start traveling of the shutter to start exposure.

(35) Similar to the step (28), the stored information about the luminance of the subject is referred to the judgment result of whether or not the stroboscopic light emission becomes unnecessary, and the predetermined value is set. If not, proceed to (36).

(36) A trigger signal is output to the strobe device ST to start strobe light emission.

(37) Wait for the flash emission to end.

If the result of determination in step (35) is equal to or greater than the predetermined value, stroboscopic photography is not performed, so steps (36) to (37) are not executed ((3)
Proceed to 8).

(38) Wait for the exposure time based on the shutter speed determined in step (23) or (26) to elapse.

(39) The shutter is closed by controlling the exposure control means SH.

(40) The exposure control means SH is controlled to open the diaphragm.

(41) The mirror drive mechanism (not shown) is controlled to start the down of the main mirror.

(42) The output of the light source detecting means CM is input to read the information on the hue of the illuminating light of the subject. As a specific configuration example of the circuit of the light source detection means CM, the one shown in FIG. 8 can be cited.

In FIG. 8, SR, SG, and SB are photoelectric conversion elements in which red, green, and blue have spectral sensitivities, respectively.
Logarithmic compression amplifiers A1, A2, A3 are connected to the respective photoelectric conversion elements SR, SG, SB, and convert the photocurrent generated by the photoelectric conversion elements SR, SG, SB into a logarithmically compressed voltage signal. S1 and S2 are subtraction circuits. The outputs of the logarithmic compression amplifiers A1 and A2 are input to S1, and the outputs of the logarithmic compression amplifiers A2 and A3 are input to S2, and the respective subtraction results are output. As a result S
The output of 1 is information about the ratio of red and green of the spectral components of light incident on the photoelectric conversion element, and the output of S2 is the ratio of green and blue of the spectral components of light incident on the photoelectric conversion element. Information is output. As a result, information about the spectral characteristics of the subject illumination light is obtained, and the control device PRS further performs an operation of estimating the type of the subject illumination light source from such information. This work is described in Japanese Patent Application Laid-Open No. 7-114092 mentioned above, so a detailed description thereof will be omitted, but as a result of the work, whether the subject is illuminated by natural light or a fluorescent lamp,
Alternatively, it can be determined whether or not it is illuminated with tungsten light.

As described with reference to FIG. 4, the light source detecting means CM is independent of the photographing optical system and can detect the signal regardless of the elevation of the mirror. In addition, the step (19)
At this timing, the light emitting means AUX is extinguished, the light emitting means RL is extinguished at step (31), and the strobe device ST has also finished emitting light at step (37). Moreover, since all the light projecting means do not emit light, there is no problem in detecting the object illumination light source.

(43) Input the information of the switch SWMR for detecting the down of the main mirror and wait for the completion of the down of the mirror.

(44) A control signal is output to the motor driver MDR1 to start driving the first motor M1 to start film winding.

(45) Magnetic recording of necessary information regarding photographing. The information on the subject illumination light source detected in step (42) is included in the information to be magnetically recorded.

(46) The output of the sensor S1 is monitored to wait for the film to be fed to the position of the next frame to be photographed. When it is detected that the image has been sent to the position of the next frame, the process proceeds to (47).

(47) A control signal is output to the motor driver MDR1 to stop the driving of the first motor M1.

(48) It is determined whether or not the shooting of the last frame is completed. If the shooting of the last frame is completed, the process proceeds to the rewind step, but if not so, the process returns to (14) in FIG.

The rewinding step has no particular relation to the gist of the present invention, and therefore its explanation is omitted.

As a concrete configuration example of the light source detecting means CM, the light source is estimated from the spectral component ratio of the illumination light by the signal output from a plurality of photoelectric conversion elements having different spectral sensitivities. The configuration shown in FIG. 9 is also conceivable as a specific configuration example of the CM circuit.

In FIG. 9, SFL is a photoelectric conversion element having sensitivity in the visible light region and is input to the first stage amplifier A.
The output of the first stage amplifier A is input to the high pass filter HPF and is also connected to the output terminal VFL. The high-pass filter HPF cuts the low-frequency output component of the output of the first-stage amplifier A and outputs it to the output terminal VHP.

A technique for estimating the type of object illumination light source by detecting the flicker component of an artificial light source such as a fluorescent lamp or tungsten light from the circuit having such a configuration is also described in Japanese Patent Laid-Open No. 7-114092. Although detailed description is omitted here, it is possible to determine whether the subject is illuminated by natural light, fluorescent light, or tungsten light as a result.

[0078]

As described above, according to the first aspect of the present invention, the means for projecting light on an object to be photographed, the light source detecting means for discriminating the type of illumination light source for the object to be photographed, the photographing information for the photographing film. Magnetic recording means for magnetically recording, inputting information of the illumination light source of the photographic subject from the light source detecting means in a state where the light projecting means is not projecting light,
A camera having a control means for controlling the magnetic recording means so as to discriminate the type of the illumination light source of the photographic subject based on the input information and then magnetically record the information of the type of the illumination light source on the photographic film. By providing the above, it is possible to always detect the correct object illumination light source information.

According to the present invention of claim 6, the light source detection operation is performed from the end of the projection operation during the shooting preparation period before the start of shooting or the end of the projection operation during exposure to before the start of magnetic recording during film feeding. For example, since the light source information determination is performed while the mirror is down, the light source information determination can be executed appropriately without time loss of sequence and sequence.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a film cartridge is housed in a camera according to the present invention and a configuration of a peripheral portion thereof.

FIG. 2 is an explanatory diagram showing a recording unit in each frame of a film.

FIG. 3 is a block diagram showing a circuit configuration of a camera according to the present invention.

FIG. 4 is a configuration diagram showing a light source arrangement of a camera according to the present invention.

FIG. 5 is a flowchart explaining a part of the operation of the camera of the present invention.

FIG. 6 is a flowchart illustrating a part of the operation of the camera of the present invention.

FIG. 7 is a flowchart illustrating a part of the operation of the camera of the present invention.

FIG. 8 is a circuit diagram showing an example of a light source detection unit.

FIG. 9 is a circuit diagram showing another example of the light source detection means.

[Explanation of symbols]

 PRS control circuit CM light source detection means ST strobe device RL red-eye alleviation light emission means AUX auxiliary light source

Claims (7)

[Claims] 1. A light projecting unit for a photographing subject, a light source detecting unit for discriminating a type of an illumination light source for the photographing subject,
Magnetic recording means for magnetically recording photographic information on a photographic film is provided, and the information of the illumination light source of the photographic subject is input from the light source detecting means in a state where the light projecting means is not projecting light. And a control means for controlling the magnetic recording means so as to magnetically record the information of the type of the illumination light source on the photographic film after determining the type of the illumination light source of the photographic subject based on the information. A camera to do. 2. The striking means is a strobe device for illuminating a subject during photographing, a light emitting means for reducing red-eye phenomenon during stroboscopic photography, or an automatic device when focus detection or distance measurement by natural light is impossible. The camera according to claim 1, wherein the camera is at least one of means for projecting light onto a subject for focusing. 3. The camera according to claim 1, wherein the light source detection unit includes a photoelectric conversion element that outputs information regarding the spectral characteristics of the subject illumination light. 4. The camera according to claim 1, wherein the light source detection unit includes a photoelectric conversion element that outputs information regarding a flicker component of subject illumination light. 5. The camera according to claim 1, wherein the control circuit inputs the information of the illumination light source of the photographic subject from the light source detection means during the mirror down. 6. A light projecting means for projecting light onto an object to be photographed during a shooting preparation period before the start of shooting or during exposure, and information is provided for each frame of the film during a one-frame feeding period of the film after the end of exposure. In a camera system having recording means for recording information in a magnetic recording part, the state of illumination of a subject is measured during the period from the end of light projection of the light projection means to the start of recording by the recording means, and the type of illumination light source is selected. A camera system characterized in that a light source detection means for making a discrimination is operated, and information according to the discrimination result is recorded in a magnetic recording portion provided for a frame of a film by the recording means. 7. The camera system transmits a light flux through a photographing lens to a finder in a down state,
7. The camera system according to claim 6, further comprising a mirror that is in an up state during exposure, and actuating the light source detection means when the mirror is moved from an up state to a down state after the exposure is completed.