JPH03233529A - Camera - Google Patents

Abstract

PURPOSE:To prevent breakage caused by external force by providing a position detecting means for detecting that a strobe light emission part moves by a specified amount to a down side and depressing the strobe light emission part a little with the external force, thereby forcibly moving the stroboscope to a down position. CONSTITUTION:When the strobe light emission part is moved in the down direction with the external force at a stroboscope up position, the position detecting means 24b detects it and forcible driving means 37 and 38 act so that the strobe light emission part is forcibly moved to the down position by being driven by a motor. The energizing force of a spring 26 is used only for driving it to the stroboscope up position. Thus, the charging force of the spring 26 is made small and the operation by the external force from the stroboscope up position is executed without causing breakage, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a camera with a built-in strobe, and particularly to a camera having a strobe light emitting section that can be moved up and down on the top of a pentaprism.

[Prior Art] Conventionally, a camera equipped with a strobe light emitting unit that can be raised and lowered in the upper part of a pentaprism of a camera body and driven by an electric motor was disclosed in Japanese Patent Laid-Open No. 63-195.
No. 637 has been proposed. According to this proposal, the forward and reverse rotation of the motor is directly connected to the strobe light emitting section through a gear train to perform up and down operations.

Furthermore, Japanese Patent Laid-Open No. 75232/1983 has also proposed a device in which the strobe light emitting section is raised and lowered electrically.

[Problem to be Solved by the Invention] However, in the former conventional example, when the strobe is in the up state, when trying to store the strobe light emitting part in the camera body, even if you push the flash emitting part directly with your hand, it does not move, which is troublesome. At the same time, there was concern that the transmission gear train would be damaged by the action of such external forces.

In addition, the latter conventional example has a mechanical structure that absorbs it with a spring so that the strobe light emitting part can be directly pushed in the strobe up state, but for this reason, it is difficult to drive the strobe from the down state to the up state. It is necessary to charge another spring that is stronger than the above spring, and there is a problem in that the load on the motor is large.

The purpose of the present invention is to solve such conventional problems and provide a camera with a built-in strobe that can push the strobe in the downward direction using an external force without increasing the load on the motor. be.

[Means for Solving the Problems] The gist of the present invention is to provide a camera in which a strobe light emitting unit is attached to the camera body so as to be able to move up and down. a spring that biases the strobe light emitting unit in the up direction, and the rotation of the motor drives the strobe light emitting unit in the up direction via the biasing force of the spring, and conversely drives the strobe light emitting unit in the down direction while charging the spring; A drive transmission system that allows the strobe light emitting section itself to move in the down direction by an external force, a position detection means that detects movement of the strobe light emitting section from an up position to a down position, and a signal from the position detection means. The device is characterized by having a forced drive means for forcibly rotating the driving motor to move the strobe light emitting part in the down direction by driving the motor when it is detected that the strobe light emitting part is moved in the down direction by an external force. It's on the camera.

[Function] In the camera configured as described above, when the strobe light emitting part is moved in the down direction by an external force when the strobe is in the up position, the position detection means detects this and the forced drive means operates, and the strobe is driven by the motor. Forcibly move the light emitting part to the down position.

In addition, since the biasing force of the spring is used only to drive the strobe to the up position, the force of the spring can be kept small (and operation by external force from the strobe up position can be performed without causing damage).

[Example] The present invention will be described in detail below based on an example shown in the drawings.

FIG. 1 is a side view showing an embodiment of the camera according to the present invention, showing the strobe down state, and FIG. 6 is a top view thereof. 2 is a plan view of the strobe up-down mechanism shown in FIG. 1, and FIG. 7 is a sectional view thereof. Third
4 are a side view and a plan view showing the strobe-up state, and FIG. 5 is a perspective view of the strobe operation switch.

In this embodiment, a strobe light emitting unit is disposed above a pentaprism of an eye reflex camera, and a strobe case 30 equipped with the strobe light emitting unit is driven up and down. There are two types: those that are attached to the side and those that are attached to the top cover 31 of the camera body, which is provided at the top of the camera body.

1 is a motor, and 2 is a gear fixed to the output shaft of the motor 1. Gear 3 is a two-stage gear that reduces the output of gear 2 and transmits it to sun gear 4. A planetary gear 6 is supported by a planetary arm 7 so as to be able to revolve around the sun gear 4.

The planetary gear 6 is provided with a friction mechanism (not shown) to generate a revolving force. When the sun gear 4 rotates clockwise, it meshes with the gear 9 and rotates the gear 10, which is integrally formed with the drive cam 11, counterclockwise, as shown in FIG. Furthermore, when the direction of power supply to the motor 1 is reversed, the sun gear 4 rotates counterclockwise, and the planetary gear 6 revolves counterclockwise and meshes with the gear 19. The gear 19 is connected to a mirror drive (not shown) and a shutter charge mechanism (not shown), and performs a pre-exposure preparation operation. Regarding the drive system, see JP-A-63
169632, etc., so the explanation will be omitted.

Reference numeral 7 denotes a planetary switching limiting member, which is coaxially and frictionally coupled to the planetary gear 6. 8 is a planetary switching restriction cam;
The movement of the restriction bin 7a is restricted. This mechanism is designed to prevent the planetary gear 4 from disengaging from the gear 9 when it is reversely driven by the gear 9.
2-23027, detailed explanation will be omitted.

As is clear from the above description, the gear 10 is driven only in the counterclockwise direction. A phase board 12 is fixed to the gear 10 and rotates integrally with the gear 10. The phase substrate 12 has conductive patterns 12a, 12b, and 12c on its surface, and three concentric rows of patterns are arranged in a conductive state. The conductive pattern 12a with the smallest diameter is in a conductive state all around, and is connected to GND.
The GND potential is input from the contact 16a of the manual contact piece 16. The outermost conductive pattern 12c comes into contact with the contact 14a of the signal detection contact piece 14, and functions as a energization stop signal to the motor 1. In the strobe down state shown in FIG. 2, the contact 14a and the conductive pattern 12c are electrically connected, and the signal detection contact 14 is supplied with the GND level. When the strobe up drive reaches a predetermined stop phase, the conductive pattern 12c and the contact 14a are brought out of contact, the signal detection contact 14 becomes a Hi level state, and the energization to the motor 1 is stopped. The conductive pattern 12b is the signal detection contact piece 15
The contact point 15a functions as an up-down stop position confirmation signal. The signal detection contact piece 15 is supplied with a Hi level signal at the strobe down position and a GND signal at the strobe up position. With this configuration, it is possible to confirm that the overrun after the motor energization is stopped is within a predetermined value.

The contact piece 15 is held by the holder 13 and connected to the connecting part 14b.
, 15b, and 16b.

The drive lever 18 is swingably supported about a shaft 18a, and the roller 17 is supported by a roller shaft 18b provided on one side of the small lever. The roller 17 contacts the drive cam 11. In the strobe down state, the drive cam 11 is in contact with the roller 17 at its maximum lift, and in the strobe up state,
As shown in FIG. 4, the roller 17 is
come into contact with. The above is the drive mechanism provided on the camera body side.

Next, a description will be given of a drive mechanism provided on the top lid 31 side of the camera body in order to move the strobe case 30 up and down in conjunction with the drive lever 18 described above.

Reference numeral 21 denotes a holding member for supporting the drive mechanism with respect to the camera body, and as shown in FIGS. 2 and 7, it is fixed inside the upper lid 31. A cylindrical bearing 22 passes through the holding member 21 and is fixed by caulking.

As shown in FIG. 7, one end of the bearing 22 passes through a positioning hole formed in the side wall of the top lid 31, and the rear end of the strobe case 30 is rotatable using the penetrating end as a support shaft. It is pivoted.

On the other hand, a transmission shaft 23 is rotatably inserted into the cylinder of the bearing 22 and has both ends formed to have a width across flats.
An outer lever 27 is non-rotatably mounted on the outside of the top cover 31 and fixed with a screw 28, and an inner lever 24 is non-rotatably mounted on the inside of the top cover 31 at the other shaft end and fixed with a screw 25. has been done.

As mentioned above, the strobe case 30 is rotatable about the bearing 22, but when the strobe case 30 is positioned at the strobe up position shown in FIG. A long hole 30d is formed in the strobe case 30, and the stopper bin 32 engages with the long hole 30d, and the stopper portion 30c at the lower end of the long hole 30d comes into contact with the stopper bin 32, thereby determining the up position of the strobe. . A strobe light emitting unit consisting of a xenon tube 33, a reflector, and a Fresnel lens 35 is provided at the front end of the strobe case 30, the outer periphery of which is covered with a strobe cover 36, and a screw 28 that fixes the outer lever 27.
etc. are not exposed to the outside. As shown in FIGS. 1 and 3, the outer surface of the strobe case 30 includes a lever contact portion 30b that contacts a contact portion 27b formed at the tip of the outer lever 27, and the other side of an absorption spring 29, which will be described later. A spring locking protrusion 30a is formed to which the arm portion 29b of the spring locking projection 30a is locked. 29 is an absorption spring attached to the outer periphery of screw 28,
As shown in FIG. 1, the arm portion 29a of one spring end engages with the locking portion 27a of the outer lever 27, and
9b is locked to a spring locking protrusion 30a of the strobe case 30, and spring biases the outer lever 27 clockwise and the strobe case 30 counterclockwise. Then, due to this spring biasing force, the contact portion 27b of the outer lever 27 and the lever contact portion 30b of the strobe case 30 come into contact with each other.
Pull the strobe case 30 and outer lever 27 together.

Reference numeral 26 denotes a strobe-up spring, which is attached to the outer periphery of the bearing 22. One spring end arm 26a is locked to a spring locking part 21a formed at the front part of the holding member 21, and the other spring end arm 26b to the inner lever 24, and
is biased clockwise by a spring to generate strobe-up force.

That is, when the up spring 26 is in a charged state at the strobe down position shown in FIG. 1 and the inner lever 24 is released, the spring force of the up spring 26 causes the transmission shaft 23 to move clockwise via the inner lever 24. Rotate to . As the transmission shaft 23 rotates clockwise, the outer lever 2
7 and the contact portion 30b of the strobe case 30.
Due to this contact, the strobe case 30 rotates clockwise, and the stopper part 30c in the elongated hole 30d of the strobe case 30 comes into contact with the stopper bin 32 of the upper lid 31, thereby completing strobe up.

In this state, when the inner lever 24 is rotated counterclockwise,
The outer lever 27 is rotated counterclockwise via the transmission shaft 23 via the absorption spring 29, and a stopper portion 36a formed at the tip of the strobe cover 36 comes into contact with a stopper (not shown) provided on the upper lid 21. Rotate until they touch. Further, when the inner lever 24 is rotated counterclockwise, the outer lever 27 is rotated counterclockwise against the spring force of the absorption spring 28, and at this time, the absorption spring 28 is charged with spring force.

In this embodiment, by rotating clockwise and counterclockwise,
The inner lever 24, which controls the up and down movement of the strobe, is rotated by the aforementioned drive lever 18, and one lever end 24a of the inner lever 24 and one lever end 18c of the drive lever 18 are connected to the first lever end 24a. They are engaged in the state shown in Figures 3 to 3. Therefore, in this embodiment, when a downward external force is applied to the strobe by hand in the strobe up state (FIG. 3), the strobe can be rotated against the spring force of the up spring 26.

Also, inside the upper lid 31, there is a first switch that detects the up/down state of the strobe based on the rotational position of the inner lever 24.
For example, when the strobe case 30 is pushed down by an external force by a predetermined amount from the strobe up state, this is detected. This will be explained later.

In the strobe down state shown in FIGS. 1 and 2, the clockwise rotation of the drive lever 18 causes the inner lever 24 to rotate counterclockwise against the up spring 26. At this time, the stopper part 36a of the strobe cover 36 comes into contact with a stopper (not shown), and the counterclockwise rotation of the strobe case 30 and the strobe cover 36 is prevented. In this state, it becomes possible to manage the mating portion between the strobe cover 36 and an exterior component (not shown) with a gap based on the abutting portion. In order to absorb errors in the interface of the drive lever 18, cam part 18c, inner lever 24, etc. that connect the mechanisms on the camera body side and the upper lid 31 side, the inner lever 24 is sufficiently overcharged in the counterclockwise direction, and the Absorption spring 29
It is absorbed by Further, the holding force of the strobe cover 36 is also determined by the force of the absorption spring 29. According to this embodiment, even if the stored force of the absorption spring 29 is set to a large value, the operating angle corresponding to the overcharge is small, so that energy loss is very small.

FIGS. 3 and 4 are diagrams showing the strobe-up state in the present invention. The roller 17 comes into contact with the drive cam 11 at the minimum lift portion, and the inner lever 24 rotates clockwise due to the biasing force of the up spring 26, and the contact portion 27b of the outer lever 27, which rotates integrally with the inner lever 24, rotates in the strobe. Case 3
0, the strobe case 30 is rotated clockwise, and the clockwise rotation is prevented by the contact between the stopper bin 32 and the abutment portion 30c, and the strobe case 30 is stopped at the strobe up position. Note that although only the drive side of the rotation shaft and stopper of the strobe case 30 is shown, the other end (not shown) is supported in a similar manner.

FIGS. 5(a) and 5(b) are diagrams showing switches related to strobe operation. FIG. 5(b) shows a strobe position detection switch, a signal contact piece 37 is attached to the upper cover 31 side, and the GND level is inputted from a terminal portion 37a. The signal contact piece 38 is in the strobe down state shown in the figure.
The contact portion 38a contacts the signal contact piece 37 and is in a conductive state. The terminal section 38b is a signal output section. As described above, the inner lever 24 is in the state shown in the figure when the strobe is down, and as shown in FIG. 1, the detection portion 24b, which is one end of the other lever, and the signal contact piece 37 are in a non-contact state. When the strobe is up, the detection part 24b of the inner lever 24 comes into contact with the signal contact piece 37, as shown in FIG.
Since this becomes non-conductive, the signal contact 38 outputs a Hi level signal. The external detection bin 40 is used to detect the attachment of a strobe, and the external one is used to detect the signal contact piece 39 when a strobe is attached.
The contact portion 39a is released from contact with the signal contact piece 37. In other words, the signal contact 39 receives a GND level signal when the strobe is not attached when it is externally connected, and a Hi level signal when it is attached to the terminal section 39b.
Output from. In FIG. 5(a), reference numeral 41 denotes an operation button, which, when pressed, moves the signal contact piece 42 and brings it into conduction with the contact portion 43a of the signal contact piece 43. A GND level is inputted from the terminal section 42a, and a signal is outputted from the terminal section 43b.

In the external view of the camera shown in FIG. 6, reference numeral 44 indicates an accessory shoe. 45 indicates a leaf spring, which is attached externally to prevent wobbling when the strobe is attached. The aforementioned detection bin 40 is provided on the rail portion of the accessory shoe 44. The strobe cover 36 is placed away from the accessory shoe 44. The aforementioned operation button 41 is provided on the upper lid 46 on the left opposite side of the flash cover 36 on the optical axis with respect to the release button 47 .

Dial 448, buttons 49, 52, 53 are for mode selection,
This is an operating member for changing set values. 5o is an information display window. A mode dial 51 is used to select a shooting mode. The details of the function of the operation button 41 will be described later, but each time it is pressed, the flash is reversed up and down, and it can be operated with the left hand while operating the release button 47 etc. with the right hand, or while looking through the viewfinder (not shown). It is very easy to operate as it is laid out in a way that allows for easy operation. In addition, since the reverse operation is performed using - buttons, prompt operation is possible without any operational errors. Especially in autofocus cameras, there is no need to operate the distance ring with the left hand, resulting in better matching.

FIG. 8 is a diagram showing the control circuit of this embodiment. Signal contact 3 that detects photometric value information from the photometric circuit and strobe position
8, the output of the signal contact 43 generated at the operation button 41,
The output of the external signal contact piece 39 that detects the attachment state of the strobe is input to the micro processor MPU, and the output of the signal detection contact pieces 14 and 15 is also input to the MPU.
1 and supplies a drive signal to the motor driver according to a predetermined sequence to control the energization of the motor 1. The motor driver has a bridge circuit that can switch the motor 1 between forward and reverse energization drive and an electric brake state forming a short circuit.

FIG. 9 shows the energization state of the motor 1 and the potential state of the signal detection contacts 14 and 15 during strobe-up operation. In the strobe down state, the signal detection contact 14 is at GND level,
The signal detection contact 15 is at Hi level and starts energizing the motor 1 in response to the drive start signal from the MPU 72. The energization pattern is such that the driving speed of the motor 1 is slowed down by repeating duty energization in which the current is applied for a predetermined time and the electric brake is applied for a predetermined time. During driving, the signal detection contact 15 is switched to the GND level, and with the signal detection contact 14 switched to the Hi level, power to the motor 1 is stopped and the electric brake is continued to be applied.

FIG. 10 shows the energization state of the motor l and the potential state of the signal detection contacts 14 and 15 during strobe down operation. When the strobe is up, the signal detection contact 14 is at Hi level.
The signal detection contact 15 is at GND level. When energization to the motor 1 is started, the signal detection contact 15 is switched to Hi level, and when the signal detection contact 14 is switched to GND level, the energization to the motor 1 is stopped and the electric brake is continued to be applied.

The operation of this embodiment will be explained below.

First, driving from the strobe down state shown in FIGS. 1 and 2 to the strobe up state shown in FIGS. 3 and 4 will be described. Power supply control to the motor 1 follows the sequence shown in FIG. The motor 1 is energized in the forward direction, and the gear 10 begins to rotate counterclockwise. The roller 17 starts moving toward the minimum lift area from the top dead center contact area of the cam 11. At this time, the inner lever 24 starts rotating clockwise due to the biasing force of the up spring 26. As a result, the drive lever 18 also rotates counterclockwise, and the action of the rollers 17 and cam 11 causes the gear 10 to rotate counterclockwise, creating a force that attempts to further accelerate the rotation of the motor 1 due to the forward current energization. acts.

At this time, the clockwise rotation of the gear 9 generates a force that tries to drive the planetary gear 6 counterclockwise, and the planetary gear 6
It is thrown off and revolves counterclockwise, attempting to disengage from the meshing state with gear 9. However, since the planetary switching limiting member 7 is biased counterclockwise by friction, the limiting pin 7a comes into contact with the stopper part 8a of the planetary switching limiting cam 8, and the gear 9 and the planetary gear 6 are not disengaged from each other. . Therefore, the rotational speed of the gear 9 never increases beyond the speed controlled by the motor 1 side. If the gears are disengaged, the strobe will rise at a speed determined by the biasing force of the up spring 26. The purpose of raising the flash when using a flash is to keep the light emitting part as far away from the optical axis of the photographic lens as possible, and from the rotation axis, in order to prevent red eye (a phenomenon in which eyes appear red in color photography). It is required that the length of the arm up to the light emitting part be as long as possible.Furthermore, the mass of the strobe light emitting part, etc. is also not small.Therefore, the rotational moment around the drive shaft becomes large.

In this state, in order to set the holding force at the time of raising up to a predetermined value or more, the biasing force of the up spring 26 must be enormous.
The impact when the camera is raised becomes extremely large, causing impact noise and bouncing. This differs greatly depending on the attitude of the camera. In this embodiment, although the planetary clutch allows the motor to rotate in forward and reverse directions, the engagement between the planetary gear 6 and the gear 9 is guaranteed, so that the above phenomenon can be avoided. However, if the motor 1 is simply energized in the forward direction, it is not possible to sufficiently brake the rising speed of the strobe up mechanism as described above, and it is not possible to completely suppress the impact noise and bouncing when the strobe is raised.

In this embodiment, as shown in FIG. 9, the strobe up speed is controlled by carrying out duty energization that repeats energization and electric braking to the motor 1 at predetermined time intervals, so that the strobe up speed is controlled. Sound and bounce can be completely suppressed. The on-ratio and cycle of this duty energization can be set to any pest state. When starting up drive, roll 1
7 is stopped at the top dead center of the cam 11, and the up spring 26
Since it can be driven using only the driving torque that overcomes the frictional force generated by the biasing force of the absorption spring 29, it can be easily driven even when the above-described duty drive is performed, and the allowable range of the duty-on ratio is wide. Furthermore, it goes without saying that there is no problem in the state where the cam lift is starting to reach the above-mentioned minimum cam lift.

When the phase detection contact piece 14 switches from the GND level to the Hi level, the power supply to the motor 1 is stopped and the motor 1 is controlled by applying an electric brake. In this state, if the signal of the phase detection contact 15 remains at the GND level,
It is determined that the stop phase of the cam 11 is within the permissible range, and the process moves to a photographing sequence that includes strobe light emission. If the signal from the phase detection contact 15 does not reach the desired state, it is desirable to drive it again and stop it at the normal stop position. Further, if the normal stop position cannot be obtained by re-driving, it may be determined that a trouble has occurred, a warning may be issued to the user, and the camera operation may be stopped.

Next, driving from the strobe up state shown in FIGS. 3 and 4 to the strobe down state shown in FIGS. 1 and 2 will be described. Power supply control to the motor 1 follows the sequence shown in FIG. 1O. The motor 1 is energized in the forward direction, and the gear 10 is
begins to rotate counterclockwise. The roller 17 starts moving from the minimum lift area of the cam 11 to the maximum lift area.

At this time, the drive lever 1 resists the biasing force of the up spring 26.
8 rotates clockwise, rotates the inner lever 24 counterclockwise, and starts strobe down operation. The energization of the motor 1 continues in a fully energized state, unlike the energization at the time of power-up described above. Stopper part 36a of strobe cover 36
When it comes into contact with a stopper (not shown) and stops at the down position, the absorption spring 29 is charged, and the contact portion 27b of the outer lever 27 and the contact portion 30b of the strobe case 30 are released from contact. When the roller 17 reaches the top dead center of the cam 11,
The phase detection contact piece 14 changes from Hi level to GND level, stops energizing the motor 1, and applies an electric brake to perform braking. If the phase detection contact 15 is at Hi level in this state, it is determined that the stop position is normal, and the control is terminated. If the signal is not the desired one, a sequence similar to that at the time of stopping the strobe up described above is entered. As described above, in the down state, the absorption spring 29 acts and the strobe cover 36 can be held with strong force, so there is no practical problem even if a special locking rock structure is not provided.

FIG. 11 is a flowchart illustrating the operation when the operation button 41 is operated. With the power turned on using the mode dial 51, the signal level of the signal contact 43 is checked at predetermined time cycles. When the level is Hi, the check is repeated. When switched to the Lo level, a wake-up operation is performed, and a DC/DC converter (not shown) is operated to put various circuits into an operating state. In order to determine the phase of the cam 11, the signals of the signal detection contacts 14 and 15 are checked. When the output of the signal detection contact 14 is Lo and the output of the signal detection contact 15 is Hi, it is determined that the strobe is down, and furthermore, when the signal contact 39 is at the LO level and it is determined that the external strobe is not attached. enters the up operation. Start energizing motor 1 and apply electric brake to Bmsm upper and rear motor 1 for 6 m.
Intermittent duty energization is repeated by multiplying by s. When the signal detection contact 14 reaches the Hl state and the signal detection contact 15 reaches the Lo state, the power supply to the motor 1 is stopped and an electric brake is applied. With the above steps, the strobe-up operation is completed. When determining the phase of the cam 11 earlier, if it is determined that the strobe is not in the down state based on the outputs of the signal contacts 14 and 15, energization to the motor 1 is started, and the signal detection contact 14 is set to L.
The current is continued until the signal output contact 15 reaches the O level and the Hi level, and then an electric brake is applied to the motor 1 to complete the strobe down operation.

FIG. 12 is a flowchart showing the operation when the strobe is pushed in by an external force.

When the power is turned on using the mode dial 51, the signal level of the signal contact 38 is checked at predetermined time cycles. Check repeatedly when the level is Hi. When switched to Lo level, wake-up operation is performed and D (not shown) is activated.
Operates the C/DC converter and puts various circuits into operation. To determine the phase of the cam 11, the signal detection contact piece 14.
15 signal check is performed. When the output of the signal detection contact 14 is Lo and the output of the signal detection contact 15 is Hi, it is determined that the strobe is down, and the motor 1 is braked to end the sequence. If the strobe down state cannot be determined by the sequence check described above, start energizing the motor 1 and continue energizing until the output of the signal detection contact 14 becomes Lo level and the output of the signal detection contact 15 becomes Hi level. After that, the brake is applied to motor 1 to complete the strobe down operation. Regarding the strobe attachment detection, when the output from the signal contact 39 becomes Hi level, the strobe down operation is performed according to the same flow as this sequence, so a description thereof will be omitted.

That is, when the strobe is in the up position, the strobe case 30 can be moved in the down direction by an external force, and as the strobe case 30 moves, one lever end 24a of the inner lever 24 is moved to the lever end 18c of the drive lever 18. Rotates counterclockwise without interference. At this time, by rotating the inner lever 24 in the counterclockwise direction, the detection part 24b of the inner lever 24 pushes the signal contact piece 37 upward, and changes the signal contact piece 37 from the strobe up state in which it is disconnected from the signal contact piece 38. With its elastic restoring force, it moves in the direction of contacting the signal contact piece 38 and making it conductive, and the signal contact piece 38 outputs a Lo level signal. Therefore, the MPU drives the motor 1, drives the drive lever 18, brings the lever end 18c into contact with the lever end 24a of the inner lever 24 that is being moved by external force, and thereafter does not rely on external force. can also be moved to the down position.

[Effects of the Invention] As explained above, by making the strobe light emitting part movable against the spring biasing force in the strobe up position, and by providing a position detection means for detecting that it has moved by a predetermined amount to the down side when operated by an external force. By pushing down the strobe light emitting part slightly with an external force, the strobe can be forcibly moved to the down position, eliminating the hassle and preventing damage.Furthermore, the motor load for raising and lowering the strobe is also small. There is an effect that can be achieved.

[Brief explanation of drawings]

1 to 7 show an embodiment of the camera according to the present invention, FIG. 1 is a side view showing the strobe down state, FIG. 2 is a plan view of its drive mechanism, and FIG. 3 is the strobe up state. 4 is a plan view of the drive mechanism, FIG. 5(a) is a perspective view of the operation button, FIG. 5(b) is a perspective view of the strobe position detection switch, and FIG. 6 is a plan view of the camera. Figure, 7th
The figure is a sectional view of the drive mechanism. Figure 8 is a block diagram of the camera's strobe drive system, and Figure 9 is the motor duty cycle.
A timing chart showing the energization control, FIG. 1O is a timing chart of motor energization when the mirror is down, and FIGS. 11 and 12 are flowcharts, respectively. 1...Motor 2, 3.4...Gear 6.
... Planetary gear 7 ... Planetary arm 8 ... Planetary switching control cam 9, 10 ... Gear 11 ... Drive cam 12 ... Phase board 13 ... Holder 14.15 ... Signal Detection contact piece 18... Drive lever 21... Holding member 22.
...Bearing 23...Transmission shaft 24...Inner lever 27...Outer lever 30...Strobe case 31...Top lid 26...Up spring 37
．． 38...Signal contact piece 41...Operating button and 4 others Fig. 1 Fig. 3 Fig. 5 (b) Fig. 7 Signal detection contact piece 15 Fig. 9 Fig. 10

Claims (1)

[Scope of Claims] 1. A camera in which a strobe light emitting unit is attached to the camera body so as to be able to move up and down, including a driving motor, a spring that biases the strobe light emitting unit in the upward direction, and a spring that biases the strobe light emitting unit in the upward direction. A drive that drives the strobe light emitting unit in the upward direction through the biasing force of the spring, and conversely drives the strobe light emitting unit in the down direction while charging the spring, and allows the strobe light emitting unit itself to move in the down direction by an external force. a transmission system, a position detecting means for detecting movement of the strobe light emitting section from an up position to a down position, and when detecting that the strobe light emitting section has been moved in the down direction due to an external force based on a signal from the position detecting means; A camera characterized by having a forced drive means for forcibly rotating the drive motor to move the strobe light emitting section in a downward direction by the motor.