JPH09251179A - Detector of clutch engagement and disengagement state - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the engagement and disengagement states of a clutch without provision of a switch. SOLUTION: A transmission gear 133 of the clutch 100 is engaged and disengaged with and from a driven gear 116. An arm 132 is freely rotatably provided with this transmission gear 133. This arm 132 is fixed to a revolving shaft 131 disposed at a supporting plate 115. This revolving shaft 131 is freely rotatably disposed at a cylindrical member 141 consisting of an insulating material. An elastic contact member 145 is brought into elastic contact with the projecting end of the revolving shaft 131 from the supporting plate 115. This elastic contact member 145 is connected to a lead wire 146 and this lead wire 146 is connected to a power source via a pull-up resistor 147 and is branched from a branching part 146a and is connected to a system control circuit. The driven gear 116 is electrically grounded via the supporting plates 114, 115.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch that is provided in, for example, a camera and that transmits a rotational driving force of a drive motor to a recording medium in order to transfer the recording medium.

[0002]

2. Description of the Related Art Hitherto, for example, Japanese Patent Application Laid-Open No. Hei 5-2280 has proposed a photographic material in which a recording medium itself is directly electronically developed and a developed visible image can be obtained immediately. Such an electronically developed recording medium is referred to as an electro-developing recording medium in this specification.

In a camera using such a recording medium, when recording an image obtained by a photographing optical system on the recording medium, for example, R (red), G (green) and B are recorded.
The recording medium is moved by one screen by the first drive motor to obtain three (blue) screen images, and the recording medium is moved by the second drive motor to read the developed image from the recording medium. It is possible to configure to transfer one horizontal scanning line segment at a time. In such a configuration,
A clutch is provided between each drive motor and the drive mechanism of the recording medium.

[0004]

In order to control the transfer of the recording medium, it is necessary to detect the discontinuous state of the clutch. Therefore, a switch member for detecting the intermittent state is usually provided at a predetermined position, and this switch member causes a problem that the configuration of the arranged wiring becomes complicated.

The present invention is intended to solve such a problem, and an object thereof is to make it possible to detect the discontinuous state of the clutch without providing a switch member, and to simplify the structure.

[0006]

DISCLOSURE OF THE INVENTION A clutch on / off state detecting apparatus according to the present invention is a clutch configured to connect / disconnect a transmission gear to a driven gear by an arm that rotatably and movably supports the transmission gear. In addition, the arm, the transmission gear, and the driven gear are formed of a conductive material, and the arm and the driven gear are connected to different potential levels, respectively, and a change in the potential of either one is detected to determine the connection state of the transmission gear. It is characterized in that a detection means for detecting the above-mentioned and the cutoff state is provided.

The arm is swingably supported by a support plate by a rotating shaft, for example. In this case, it is preferable that the transmission gear, the arm and the rotary shaft are electrically connected, and the detection means is configured to detect the intermittent state of the transmission gear and the driven gear via the rotary shaft.

In such a structure, it is preferable that the rotary shaft is rotatably supported by the support plate, and the space between the rotary shaft and the support plate is insulated by a tubular member made of an insulating material. The transmission gear meshes with the driven gear by swinging the arm in the forward rotation direction when the drive motor rotates in the forward direction, and meshes with the driven gear by swinging the arm in the reverse rotation direction when the drive motor rotates in the reverse direction. It may be configured to mesh with the drive gear. Further, the transmission gear is configured to be released from the driven gear by swinging the arm in the opposite direction by a predetermined amount from the state where the arm swings and the transmission gear meshes with the driven gear. Good.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external view of a still video camera to which an embodiment of the present invention is applied.

When the camera body 11 is viewed from the front, a photographing optical system 12 having a photographing lens and the like is provided in the front substantially center thereof, and a strobe 13 is provided above and right of the photographing optical system 12. A release button 14 is provided on the side opposite to the strobe 13. The finder 15 is provided at the center of the upper surface of the camera body 11 and extends from the front surface to the rear surface of the camera body 11. A main switch 10 for turning on the power is provided on the side of the finder 15 and on the upper surface of the camera body 11. Camera body 1
A scan start switch 16 for starting the reading of an image on the electro-developing recording medium 30 is provided on the upper surface of No. 1 on the opposite side of the main switch 10 across the finder 15. Since the image signal obtained by this camera is output to an external recording device or the like, the camera body 1
An output terminal 17 is disposed on the lower portion of the side surface of the No. 1. Further, the electro-developing recording medium 30 is provided on the side surface of the camera body 11.
A slot 18 for mounting the
A discharge switch 19 that is pressed when the electro-developing recording medium 30 is pulled out from the slot 18 is provided in the vicinity of 8.

FIG. 2 is a block diagram of a still video camera. The system control circuit 20 is a microcomputer and controls the entire still video camera.

The photographing optical system 12 includes a plurality of lens groups,
An aperture 12a is provided. An electro-developing recording medium 30 is provided behind the imaging optical system 12, and a color filter (color separation filter) 70 is provided in front of the electro-developing recording medium 30. A quick return mirror 21 is provided between the photographing optical system 12 and the color filter 70, and the quick return mirror 21 and the color filter 7 are provided.
Between 0, a shutter 22 is provided. Above the quick return mirror 21, a focus plate 23a of the finder optical system 23 is provided.

The electro-developing recording medium 30 is provided with first to third recording areas 30R, 30G and 30B, and each recording area 30.
R, 30G, and 30B each have a size of one screen. The color filter 70 includes an R (red) filter element 70R, a G (green) filter element 70G, and a B (blue) filter element 70B.
0R, 70G, and 70B are recording areas 30R, 30G, 3
It has the same size as 0B, that is, one screen size.

Aperture 12a, quick return mirror 21
And the shutter 22 are provided in the iris drive circuit 2 respectively.
4. Driven by a mirror drive circuit 25 and a shutter drive circuit 26, and these circuits 24, 25 and 26 are controlled by an exposure control circuit 27. The exposure control circuit 27 operates according to a command signal output from the system control circuit 20. That is, at the time of exposure control, the photometric sensor 2
The aperture of the aperture 12a is adjusted by the iris drive circuit 24 under the control of the exposure control circuit 27 based on the output signal from the iris 8. The quick return mirror 21 is normally set at a down position (in an inclined state shown by a solid line), which is a position for observing a subject, and guides light passing through the imaging optical system 12 to the finder optical system 23. During operation, under the control of the exposure control circuit 27, the mirror is rotated upward by the mirror drive circuit 25 and is set to the up position (horizontal state indicated by a broken line). The shutter 22 is normally closed, but is released for a predetermined time by the shutter drive circuit 26 under the control of the exposure control circuit 27 during the photographing operation, so that the light passing through the photographing optical system 12 The light is irradiated on the light receiving surface.

A voltage (that is, a recording medium activation signal) is applied to the electro-developing recording medium 30 under the control of the recording medium driving circuit 41, and the electro-developing recording medium 30 is exposed during the voltage application. The shooting optical system 12
Is developed as a visible image. The recording medium drive circuit 41 operates according to a command signal output from the system control circuit 20.

A support member 50 is provided near the shutter 22. The support member 50 is fixed to a fixed frame (not shown), and the support member 50 includes, for example, a light emitting element (L
A light source 42 including an ED), a scanner optical system 43, and a line sensor 44 are supported. Line sensor 4
For example, a 2000-pixel CCD one-dimensional sensor or the like can be used as 4. The light source 42, the scanner optical system 43, and the line sensor 44 are arranged in a direction substantially parallel to the optical axis of the photographing optical system 12.

The color filter 70 and the electro-developing recording medium 30 are movable in a direction perpendicular to the optical axis of the photographing optical system 12. The color filter 70 is recorded by the filter driving mechanism 71 and the electro-developing recording medium 30 is recorded. It is transported by the medium driving mechanism 80. At the time of the photographing operation, the color filter 70 and the electro-developing recording medium 30 are integrally transferred, and the R filter element 70R and the first filter are placed on the optical axis of the photographing optical system 12.
Center of the recording area 30R, the G filter element 70G and the second
The center of the recording area 30G, or the B filter element 70
B and the center of the third recording area 30B are arranged. When reading an image recorded on the electro-developing recording medium 30, the color filter 70 is positioned at a position retracted from the support member 50, for example, at the shutter 22 side. In this state, each recording area 30R, 30G, 30 of the electro-developing recording medium 30
B is transported between the light source 42 and the scanner optical system 43 in a direction perpendicular to the optical axis of the scanner optical system 43. That is, the image on the electro-developing recording medium 30 is illuminated by the light source 42 and formed on the light receiving surface of the line sensor 44 by the action of the scanner optical system 43.

The on / off control of the light source 42 is performed by the illumination light source drive circuit 45, and the line sensor drive circuit 47 controls the readout operation of the pixel signal generated in the line sensor 44.
It is performed by These circuits 45 and 47 are controlled by the system control circuit 20.

The pixel signal read from the line sensor 44 is amplified by the amplifier 61 and converted into a digital signal by the A / D converter 62. The digital pixel signal is subjected to processing such as shading correction and gamma correction in the image processing circuit 63 under the control of the system control circuit 20, and then temporarily stored in the memory 64. Note that the memory 64 may have a storage capacity for one horizontal scanning line output from the line sensor 44, or may be a memory having a storage capacity for one frame. Further, the memory 64 includes an E ² PROM, and correction values such as shading correction are stored in the E ² PROM.

The pixel signal read from the memory 64 is
The image data is input from the image processing circuit 63 to the interface circuit 65, subjected to predetermined processing such as format conversion, and can be output to an external computer (not shown) via the output terminal 17. The pixel signal output from the image processing circuit 63 can be recorded on a recording medium such as an IC memory card in the image recording device 67. The interface circuit 65 and the image recording device 67 operate according to a command signal from the system control circuit 20.

An operation section 72 including a main switch 10, a release button 14, a scan start switch 16 and the like is connected to the system control circuit 20.
According to the operation of the operation unit 72, an imaging operation, an image signal reading operation, and the like are performed. The system control circuit 20 further includes a display element 68 for displaying various setting states of the still video camera and a strobe 13.
A flash drive circuit 69 for controlling the light emission of the flash memory is connected.

FIG. 3 is a diagram showing the structure of the electro-developing recording medium 30, which is basically the same as that disclosed in Japanese Patent Laid-Open No. 5-2280. That is, the electro-developing recording medium 30 includes the electrostatic information recording medium 31 and the charge holding medium 32.
And the electrostatic information recording medium 31 and the charge holding medium 3
2 is supplied with a voltage by a power supply 33. The electrostatic information recording medium 31 includes a substrate 34, an electrode layer 35, and an inorganic oxide layer 36.
And a photoconductive layer 37. The photoconductive layer 37 is formed by polymerizing the charge generation layer 37a and the charge transport layer 37b. The charge holding medium 32 is configured by enclosing, for example, a smectic liquid crystal 40 between the liquid crystal support 38 and the liquid crystal electrode layer 39. Charge transport layer 37b of electrostatic information recording medium 31
And the liquid crystal support 38 of the charge holding medium 32 face each other with a minute gap.

The power supply 33 is on / off controlled by the recording medium drive circuit 41. When the power supply 33 is in the on state, the electrode layer 3
5 and the liquid crystal electrode layer 39, that is, the electrostatic information recording medium 3
A voltage is applied to 1 and the charge holding medium 32. When the electrostatic information recording medium 31 is exposed in this voltage applied state, charges corresponding to an image are generated on the electrostatic information recording medium 31. Since the intensity of the electric field acting on the liquid crystal 40 changes according to the charge, the image is displayed on the liquid crystal 40 as a visible image, and the subject image is developed. The charge holding medium 32 is a liquid crystal display element using a memory type liquid crystal (that is, a smectic liquid crystal in this embodiment), and the developed visible image is held even if the electric field is removed. This liquid crystal display element can erase a developed visible image by heating to a predetermined temperature using a heating device (not shown), and in that case, the same recording medium can be used repeatedly. .

4 and 5 show an electro-developing recording medium 30.
1 shows a configuration for transferring the. In the state shown in FIGS. 4 and 5, the electro-developing recording medium 30 is at the image pickup origin position (that is, the position for starting the recording operation).
The color filter 70 is omitted in these figures. Further, in FIG. 4, the imaging aperture AP corresponds to the shutter 22.

The electro-developing recording medium 30 is first moved by the DC motor (first drive motor) 91 during the recording operation.
The first recording area 30R is transferred at a speed of 1 screen at a time
The R image is recorded in the second recording area 30G, the G image is recorded in the second recording area 30G, and the B image is recorded in the third recording area 30B. After this recording operation, in the reading operation, the electro-developing recording medium 30 is transferred by the horizontal scanning line segment by the stepping motor (second drive motor) 94 at the second speed lower than the first speed. The R, G, B images are read by the line sensor 44 (see FIG. 2).

The electro-developing recording medium 30 is attached to the recording medium holding member 75. Electro-developing recording medium 30
Is at the imaging origin position, the first recording area 30R faces the imaging aperture AP.

The recording medium holding member 75 is a pair of shafts 7.
The recording medium holding member 75 is movably supported by the recording medium holding members 6 and 77.
One end of an engaging spring 112 is fixed to the fixing pin 111 by a fixing pin 111. At the free end of the engaging spring 112, the engaging protrusion 11
3 is formed, and the engaging protrusion 113 engages with the groove portion of the transfer screw 81 provided in parallel with the recording medium holding member 75. The transfer screw 81 is rotatably supported around a shaft center by a bearing 82 provided at a lower portion thereof and a bearing (not shown) provided at an upper end thereof, and a gear 117 is fitted to a lower end of the transfer screw 81.

The DC motor 91 is attached to a support plate 114 provided on a fixed frame (not shown), and the stepping motor 94 is provided on the support plate 11 provided in parallel with the support plate 114.
5 is attached. These support plates 114, 11
A clutch 100 is provided between the five.

The structure of the clutch 100 and its surroundings will be described with reference to FIGS. The clutch 100 includes an arm 132 swingably supported by a support plate 115 (see FIG. 4) via a rotary shaft 131, and a transmission gear 133 pivotally supported by the arm 132. The transmission gear 133 is a DC motor. It is possible to mesh with a driven gear 116 fixed to the output shaft of 91. The driven gear 116 meshes with a gear 117 fixed to the end of the transfer screw 81 of the recording medium drive mechanism. That is, the DC motor 91 is directly connected to the recording medium drive mechanism. On the other hand, stepping motor 94
The gear 118 fixed to the output shaft of is meshed with one gear 121 of the reduction gear mechanism 95 including a plurality of gears. The final stage gear 122 of the reduction gear mechanism 95 is axially supported by the rotating shaft 131 of the clutch 100 and meshes with the transmission gear 133. Further, the arm 132 has a rotary shaft 1
31 is fitted to the rotary shaft 131 via a friction member.
Can be rotated relative to. Therefore, the arm 13
2 rotates in accordance with the rotation direction of the gear 122, whereby the transmission gear 133 and the driven gear 116 can be connected and disconnected.

As described above, the stepping motor 94 can be connected to the recording medium drive mechanism (that is, the transfer screw 81) via the clutch 100, and, as will be described below, the transmission gear 133 and the driven gear 116 are in the meshing position. Accordingly, the transfer direction of the electro-developing recording medium 30 changes.

In FIG. 6, the transmission gear 133 is the driven gear 116.
Shows the state in which the clutch is disengaged from the vehicle. When the output shaft 118 of the stepping motor 94 normally rotates in the counterclockwise direction (arrow B direction) from this state, the arm 132 also swings in the normal rotation direction (arrow C direction), and the transmission gear 133 causes the teeth of the driven gear 116 to move. Among them, it meshes with the teeth facing the stepping motor 94. As a result, the rotation of the stepping motor 94 is transmitted to the transfer screw 81 via the reduction gear mechanism 95 and the clutch 100, the transfer screw 81 rotates clockwise in FIG. 7, and the electro-developing recording medium 30 moves up to the first position. Is transferred in the direction of.
At this time, the DC motor 91 is also driven, that is, the stepping motor 94 and the DC motor 91 cooperate to transfer the electro-developing recording medium 30.

On the other hand, as shown in FIG. 8, the output shaft 118 of the stepping motor 94 is clockwise (direction of arrow D).
When the arm 132 is rotated in the reverse direction, the arm 132 also swings clockwise (direction of arrow E), and the transmission gear 133 meshes with the tooth of the driven gear 116 that does not face the stepping motor 94. As a result, the transfer screw 81 rotates counterclockwise in FIG. 8, and the electro-developing recording medium 30 descends. That is, the electro-developing recording medium 30 is transported in the second direction, which is opposite to the first direction.

From the meshed state shown in FIGS. 7 and 8, when the stepping motor 94 rotates by a predetermined amount in the direction opposite to the rotation direction before meshing, the arm 132 swings in the opposite direction by a predetermined amount, which causes transmission. The gear 133 is the driven gear 11
6 is released, and the state shown in FIG. 6 is obtained.

FIG. 9 is a diagram showing the structure for enlarging the structure of the clutch shown in FIG. 4 and its surroundings and for detecting the disengaged state of the clutch.

A tubular member 141 made of an insulating material is fitted on the support plate 115, and the rotary shaft 131 is rotatably supported by the support plate 115 via the tubular member 141. That is, the rotary shaft 131 and the support plate 115 are electrically insulated. The transmission gear 133 is attached by a pin 142 fixed to the arm 132 so as to be rotatable and axially displaceable, and is biased by a spring 143, so that the large diameter portion 142 a formed at the lower end of the pin 142. Is engaged with. Transmission gear 133, pin 14
2, the arm 132 and the rotary shaft 131 are respectively formed of a conductive material, and therefore the transmission gear 133, the arm 132, and the rotary shaft 131 are electrically connected.

The insulating member 144 fixed to the upper surface of the support plate 115 is provided with an elastic contact member 145 having a spring property, and one end of the elastic contact member 145 has a support plate 1 for the rotary shaft 131.
It is elastically contacted with the shaft end portion 131 a protruding from 15. The elastic contact member 145 is made of a conductive material, and the end portion on the side opposite to the rotating shaft 131 has a lead wire 146 and a pull-up resistor 14.
It is connected to the power supply via 7. The lead wire 146 branches at a branch portion 146a formed in the middle of the lead wire 146 and is connected to the system control circuit 20 (see FIG. 2).

On the other hand, the transfer screw 81 is supported by the support plate 115 via the bearing 149, and the transfer screw 81, the bearing 149, and the gears 116 and 117 are made of a conductive material. The support plate 115 is grounded via the lead wire 148, so that the potential of the driven gear 116 is kept at the ground level via the gear 117, the transfer screw 81, the bearing 149, the support plate 115 and the lead wire 148. There is.

Therefore, when the transmission gear 133 and the driven gear 116 mesh with each other, the transmission gear 133 and the pin 14
2, a voltage signal of 0 V (that is, an ON signal) is output to the system control circuit 20 via the arm 132, the rotary shaft 131, the elastic contact member 145, and the lead wire 146. On the other hand, when the transmission gear 133 and the driven gear 116 are cut off, a signal of a predetermined voltage level (that is, an off signal) is output to the system control circuit 20 via the power supply, the resistor 147, and the lead wire 146. To be done. With this voltage signal, the system control circuit 20 detects the on / off state of the clutch.

FIG. 10 is a timing chart of the recording operation and the reading operation. The operation of this embodiment will be described with reference to this drawing. In the initial state, the electro-developing recording medium 3
0 is set to the imaging origin position shown in FIG.

When it is detected that the release button 14 has been pressed (reference S11), an output signal from the photometric sensor 28, that is, a photometric value is detected, and photometric calculation is performed based on this photometric value (reference S12). . Based on the result of this photometric calculation, the aperture of the diaphragm 12a changes from the fully open state to a predetermined aperture (reference S13). Next, the quick return mirror 21 changes from the down state to the up state (reference S14). Further, the stepping motor 94 rotates in a predetermined direction by a predetermined amount, and the clutch 100 is set in the disengaged state (see FIG. 6) (reference S15).

Change of the mirror 21 to the up state and the diaphragm 1
When it is confirmed that the opening degree adjustment of 2a is completed, the recording medium activation signal of the first recording area 30R of the electro-developing recording medium 30 is set to the ON state (reference S16), and the first recording area A voltage is applied to 30R. At the same time, the shutter 22 is opened for the exposure time obtained by the photometric calculation (reference S12) (reference S17). This shutter 22
Of the color filter 70, the R filter element 70R of the color filter 70 faces the shutter 22 (reference S18),
The first recording area 30R of the electro-developing recording medium 30 faces the R filter element 70R (reference S19).
That is, the R filter element 70R and the first recording area 30
R is located on the optical path of the photographing optical system 12. Therefore, an R image is formed in the first recording area 30R.

The position of the electro-developing recording medium 30 is obtained based on the signal output from the origin detector (not shown) and the rotation command signal to the DC motor 91 output from the system control circuit 20. Color filter 7
The position of 0 is also obtained by a similar configuration.

When the shutter 22 is closed, the color filter 70 is raised by one screen by the filter driving mechanism 71, and the electro-developing recording medium 30 is raised by one screen by the DC motor 91 being normally rotated (reference numeral 51). As a result, the G filter element 70G and the electro-developing recording medium 30 are
The second recording area 30G is defined on the optical path of the photographing optical system 12. That is, the G filter element 70G is the shutter 2
2 (reference S20), the second recording area 30G is G
It faces the filter element 70G (reference S21). Next, the stepping motor 94 is rotated in the reverse direction by a predetermined amount (reference S8).
1) As a result, the clutch 100 is brought into the engaged state (reference S82), the electro-developing recording medium 30 is slightly lowered, and its position is finely adjusted. In this fine adjustment, DC
The motor 91 is substantially stopped, and the stepping motor 94 is loaded with a load for rotating the DC motor 91.

After the fine adjustment, the stepping motor 94 is normally rotated by a predetermined amount (reference S83), and the clutch 100 is disengaged. Then, the recording medium activation signal of the second recording area 30G is set to the ON state (reference S22), and the second
Voltage is applied to the recording area 30G of the
Open for the exposure time obtained by the photometric calculation (reference S23). As a result, the G image is displayed in the second recording area 30G.
Formed.

When the shutter 22 is closed, the color filter 70 and the electro-developing recording medium 30 are again raised by one screen (reference S52). As a result, the B filter element 70B faces the shutter 22 (reference S24), and the third
The recording area 30B of (1) faces the B filter element 70B (reference S25). Then, the stepping motor 94 is reversely rotated by a predetermined amount (reference S84), the clutch 100 is brought into the connected state (reference S85), and the position of the electro-developing recording medium 30 is finely adjusted. After this fine adjustment, the stepping motor 94 is normally rotated by a predetermined amount (reference S86), and the clutch 100 is in the disengaged state. Next, the recording medium activation signal of the third recording area 30B is set to the ON state (reference S26), the voltage is applied to the third recording area 30B, and the exposure time obtained by the shutter 22 by the photometric calculation. Open only (reference S27). As a result, the B image is formed in the third recording area 30B.

In this way, R, G and B are respectively recorded in the recording areas 30R, 30G and 30B of the electro-developing recording medium 30.
When the image is developed, the mirror 21 changes to the down state (reference S28), and the diaphragm 12a is opened to the fully open state (reference S29). On the other hand, the DC motor 91 is driven and reversely rotated (reference S53), and the electro-developing recording medium 3
0 descends to a position where all the recording areas 30R, 30G, 30B are out of the optical path of the photographing optical system 12 (reference S5).
4).

When the scan start switch 16 is operated and the scanner drive command signal is output (reference S3).
1), the light source 42 for illumination is turned on. On the other hand, the color filter 70 is moved to the retracted position by the filter driving mechanism 71,
That is, all the filter elements 70R, 70G, 70B are retracted to a position deviated from the optical path of the reading optical system (reference S33). Further, the stepping motor 94 rotates forward (reference S56), so that in the clutch 100, the transmission gear 133 meshes with the tooth of the driven gear 116 facing the stepping motor 94 (reference S55). After that, the stepping motor 94 and the DC motor 91 are driven by the system control circuit 20 so that the transfer screws 81 rotate at the same speed (reference numerals S56 and S57), and the electro-developing recording medium 30 moves to the first position.
The upper end of the recording area 30R is set at a position corresponding to the line sensor 44. That is, in this positioning operation, the electro-developing recording medium 30 is moved by the stepping motor 9
4 and the DC motor 91, and the DC motor 91 is rotationally driven so that the load on the stepping motor 94 is reduced.

Next, the stepping motor 94 and the DC motor 91 are driven so that the transfer screws 81 rotate at the same speed (reference numerals S58 and S59), and the recording is performed in the first recording area 30R of the electro-developing recording medium 30. The scanned image is scanned. That is, the first recording area 30R of the electro-developing recording medium 30 is moved by one horizontal scanning line and stopped, and the image of the recording area 30R is detected by the line sensor 44 during the stop. In this way, also in the transfer of one horizontal scanning line, the DC motor 91 is operated by the stepping motor 9 as in the positioning operation described above.
It is rotationally driven so that the load of 4 is reduced.

Then, the electro-developing recording medium 30 is
An image signal for one horizontal scanning line is output from the line sensor 44 while the horizontal scanning line segment is being transferred. The transfer of the electro-developing recording medium 30 and the output of the image signal from the line sensor 44 are repeated, and the first recording medium 30
The R image signal is read via the line sensor 44 (reference S34, reference S35).

When the reading of the image signal from the first recording medium 30R is completed, the stepping motor 94 and the DC motor 91 are temporarily stopped and then forwardly rotated by a predetermined amount (reference S6).
0, S61), the electro-developing recording medium 30 is set at a position where the end of the second recording area 30G corresponds to the line sensor 44. Then, the image recorded in the second recording area 30G is scanned similarly to the operation of reading the image signal of the first recording area 30R (reference numerals S36 and S3).
7).

When the reading of the image signal from the second recording medium 30G is completed, the stepping motor 94 and the DC motor 91 are temporarily stopped and then rotated by a predetermined amount (reference S6).
2, S63), the electro-developing recording medium 30 is set such that the upper end of the third recording area 30B corresponds to the line sensor 44. Then, scanning of the image recorded in the third recording area 30B is performed (reference symbols S38 and S39).

When the output of the B image signal is completed, the stepping motor 94 is rotated in the reverse direction by a predetermined amount (reference S87),
The clutch 100 is set to the disengaged state (reference S7).
1). Further, the light source 42 is turned off (reference S41), and the color filter 70 is set at a predetermined initial position. Then, the DC motor 91 is reversely rotated (reference S44), and the electro-developing recording medium 30 is set at the position before the reading operation is started. Further, the stepping motor 94 is rotated in the normal direction (reference S
88), the clutch 100 is set to the connected state (reference S89).

As described above, in this embodiment, the DC voltage is applied when the electro-developing recording medium 30 is scanned by the stepping motor 94, that is, when the clutch 100 is engaged.
The motor 91 is controlled by the system control circuit 20 so that the stepping motor 94 is controlled by the electro-developing recording medium 3.
The electro-developing recording medium 30 is transferred at almost the same speed as when 0 is transferred.
Is rotationally driven so as to transfer In other words, when the clutch 100 is engaged, the DC motor 91 is rotationally driven so that the load on the stepping motor 94 is reduced.

Therefore, according to this embodiment, the DC motor 91 moves the electro-developing recording medium 30 one screen at a time, and the stepping motor 94 moves the electro-developing recording medium 30 one by one to read an image from the electro-developing recording medium 30.
In the configuration in which the horizontal scanning lines are transferred, the clutch 10
Since only one 0 is required, the configuration is simple and compact.

Further, in the present embodiment, since the transfer direction of the electro-developing recording medium 30 can be changed by the forward rotation and the reverse rotation of the stepping motor 94, the DC motor 91 is provided.
After the transfer by, the position of the electro-developing recording medium 30 can be adjusted with high accuracy, and the relative positions of the three R, G, and B screens can be accurately determined.

Further, in the present embodiment, the discontinuity of the clutch 100, that is, the discontinuity of the transmission gear 133 and the driven gear 116 is detected by the voltage level of the voltage signal output through the lead wire 146. That is, no special switch is required to detect the engagement / disengagement of the clutch 100, the rotary shaft can be used as a detection terminal, and the support plate can be downsized.

In the above embodiment, the transmission gear 133 was pulled up to the power source and the driven gear 116 was grounded. Instead of this, a signal indicating the disengagement of the clutch 100 is transmitted via the driven gear 116. It can also be configured to output.

[0058]

As described above, according to the present invention, it is possible to detect the discontinuous state of the clutch with a simple structure without providing a switch.

[Brief description of drawings]

FIG. 1 is an external view of a still video camera to which an embodiment of the present invention is applied.

FIG. 2 is a block diagram showing a circuit configuration of the still video camera of FIG. 1;

FIG. 3 is a diagram illustrating a configuration of an electro-developing recording medium.

FIG. 4 is a front view showing the configuration of a recording medium drive mechanism.

FIG. 5 is a side view showing a configuration of a recording medium drive mechanism.

FIG. 6 is a plan view showing the clutch in a disengaged state.

FIG. 7 is a plan view showing the clutch in a first connected state.

FIG. 8 is a plan view showing the clutch in a second connected state.

FIG. 9 is a diagram showing a configuration for detecting an on / off state of a clutch.

FIG. 10 is a timing chart showing a recording operation and a reading operation.

[Explanation of symbols]

 100 clutch 116 driven gear 132 arm 133 transmission gear 146 lead wire

Claims (5)

[Claims] 1. A clutch configured to connect and disconnect the transmission gear to a driven gear by an arm that rotatably and movably supports the transmission gear, wherein the arm, the transmission gear, and the driven gear are electrically conductive. In addition to being formed of a material, the arm and the driven gear are connected to different potential levels from each other, and a detection means for detecting a potential change of any one of them to detect a connection state and a disconnection state of the transmission gear is provided. A clutch on / off state detection device. 2. The arm is swingably supported by a support plate by a rotation shaft, and the detection means detects an intermittent state of the transmission gear and the driven gear via the rotation shaft. The clutch on / off state detection device according to item 1. 3. The rotating shaft is rotatably supported by a supporting plate, and the rotating shaft and the supporting plate are insulated by a tubular member made of an insulating material.
The clutch on / off state detecting device according to. 4. The transmission gear meshes with the driven gear by swinging the arm in the forward rotation direction when the drive motor rotates in the normal direction, and the arm reverses when the drive motor rotates in the reverse direction. The clutch on / off state detecting device according to claim 2, wherein the device engages with the driven gear by swinging in a direction. 5. The transmission gear is released from the driven gear by swinging the arm in the opposite direction by a predetermined amount from a state in which the arm swings and the transmission gear meshes with the driven gear. The clutch on / off state detecting device according to claim 2, wherein: