JP3466731B2 - camera - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera in which a movable lens barrel is extended and retracted so that a strobe device can be projected and stored during photographing and non-photographing.

[0002]

2. Description of the Related Art Recently, in consideration of ease of use, an increasing number of cameras have a built-in automatic flash. Some cameras with a built-in strobe have a retractable mechanism or a pop-up mechanism that allows the strobe's light emitting part to move between a retracted position inside the camera body and a light emitting position protruding from the camera body. For example, the camera controls the movement of the light emitting unit.

The camera controls the movement of the light emitting unit,
Many have been proposed for single-lens reflex cameras. In the case of a single-lens reflex camera, it is common to use a motor or a plunger to move the strobe.

However, since the lens shutter camera is small and does not have a space, if a separate drive source is provided for the flash pop-up, the size becomes larger and the cost increases. Many proposals have been made to extend the lens barrel and move the strobe in conjunction with the extension, and have also been proposed as products.

The mechanism for moving the strobe is one in which the strobe is urged by a spring to the up state and the strobe is lowered by a drive source such as a motor, or a plunger is used to lift the strobe and the down is manually performed. And so on.

In the case of a lens shutter camera, the strobe light emitting section is moved up and down by using the driving of the lens barrel. Many proposals have been made for this means.

[0007]

In the conventional system, the strobe is constantly urged upward by the spring and the strobe is lowered in conjunction with the movement of the lens barrel from the normal photographing area to the retracted state.

Therefore, when the lens barrel is extended from the retracted region to the wide end, the charging force of the spring is released, so that the lens barrel that should originally stop at the wide end is located on the telephoto side rather than the wide end. There is a problem of slippage.

Also, since the built-in strobe has wirings connected to the arc tube and lead wires such as a trigger wire connected to the circuit inside the camera body, a spring having an up force sufficient to overcome the load of the lead wire is required. Becomes Furthermore, since the lead wire becomes stiffer at low temperatures, a strong spring force including that amount is required.

Therefore, when the lens barrel is retracted to the retracted state, it is necessary to move the lens barrel against the charging force of the spring, and in the worst case, the lens barrel cannot be retracted. Will end up.

[0011]

In order to achieve the above object, in the present invention, the movable lens barrel is photographed from a non-photographing position.
A lens barrel moving mechanism and strobe that move in the shadow position
It has a device to move the movable lens barrel from the non-shooting position to the shooting position.
The strobe device moves from the retracted position to the protruding position in conjunction with the movement.
When moving the camera, move the strobe device to the retracted direction.
From the non-photographing position of the movable lens barrel to the photographing position
The moving member that moves in tandem with the movement to the
When the table is in the protruding position, the movement member moves
And a second biasing means for charging the second biasing means.
It is characterized in that the means urges the strobe device in a direction to project it .

In the strobe device, the movable lens barrel is in the non-photographing position.
When moving from the position to the shooting position, the second position
Interlocked with the movement of the moving member when it is between the position and the first position
However, when it is in the first position,
It is characterized by not interlocking .

[0013]

[0014]

【Example】

(First Embodiment) FIG. 1 is a sectional view of a strobe portion of a camera with a built-in strobe according to the present invention, and FIG. 3 is an external view. In the figure, 103 is an arc tube that emits strobe light, 102 is a reflective shade that reflects the emitted light, 101 is a Fresnel lens that collects the light from the reflective shade, and 104 is an electric lamp that presses the arc tube 103 onto the reflective shade 102. It is a silicon rubber that electrically conducts. Reference numeral 105 is a flash housing that holds the members 101 to 104. Reference numeral 106 is a strobe cover that covers the strobe light emitting portion. Reference numeral 108 is a shaft member for moving the strobe device up and down. Incidentally, 300a in FIG. 3 represents a main switch. Figure 7 shows the strobe cover 1 of the strobe device.
The perspective view which removed 06 is shown. A down biasing spring 701 as a biasing means for constantly biasing the strobe device to the shaft member 108 toward the down side (the storing direction side) and a strobe up (protruding) are required when the over stroke is on the up side. The absorption spring 702 is hooked. Next, a mechanism for raising the strobe device will be described.

FIG. 5 shows a sectional view of the entire lens barrel portion of the first embodiment. When the main switch 300a in FIG. 3 is turned on, a gear train (not shown) connected from a motor (not shown) as a drive source for the lens barrel is moved to the gear portion 11a of the cam barrel 11.
Thus, the cam barrel 11 rotates about the photographing optical axis. The cam cylinder 11 has a protrusion 11b inside the cylinder, and a front side 11c and a rear side 11d of the protrusion 11b form a cam surface. When the cam barrel 11 rotates, this cam surface moves in the optical axis direction. The front cam surface 11c is 2
The cam surface 11d on the rear side of the group is a cam surface for moving the first group.

From the first lens group, the roller shafts 412 are evenly arranged at three positions in the direction of 120 ° on a plane perpendicular to the optical axis. Similarly, from the second lens group, three roller shafts 414 are evenly arranged perpendicularly to the optical axis at three locations in the 120 ° direction. Here, FIG. 4 shows the relationship between the roller shaft 412 and the roller shaft 414 and the protruding cam surface. FIG. 4 is a plan view of the inner shape of the cam barrel. Three protrusions 11b are provided on the inner surface of the cam cylinder, and the roller shaft 412 and the roller shaft 414 are provided.
Are in contact with the cam portions 11c and 11d, respectively. In order to bring the roller shaft into contact with the cam surface, the roller shafts 412 and 2
The first group lens group is pressed to the front side (object side) by the spring 13 arranged between the roller shafts 414 of the group lens group to expand them, and the second group lens group is pressed to the rear side (film side). The lens group comes into contact with the cam surface 11d, and the second lens group comes into contact with the cam surface 11c. Therefore, the cam portion is always sandwiched between the first lens group and the second lens group.

When the cam cylinder 11 rotates in such a state, the cylindrical members linearly advancing cylinders 409a and 409b having a groove portion that allows the roller shaft to move only in the optical axis direction are fixed, so that the roller shafts 412 and 414 described above are fixed. Can move only along the optical axis along the cam surfaces 11c and 11d. Figure 4 Roll axis 4
The positions 14 and 412 are the positions of the wide end of the photographing lens, and the grooves of 409a and 409b are moved to the tele positions 409a 'and 409b' by the rotation of the cam barrel 411.
Accordingly, the roller shafts also move to the tele positions of 412 'and 414'. Since there are two grooves 409a and 409b for each cam portion for the first group roller shaft and the second group roller shaft, there are a total of six grooves.

Therefore, as the cam barrel 11 rotates, the focal length of the taking lens sequentially changes according to the rotation angle.
A compression coil spring is often used as the spring 13 for pressing the roller shafts 412 and 414 against the cam surfaces 11c and 11d.
The charging force gradually weakens due to the cam shape of the cam portion as it goes from the retracted end to the wide end, and conversely increases as it goes from the wide end to the tele end. The charging force is almost the same at the telephoto end and the collapsible end.

There is a cam groove 11e for strobe up / down on the outside of the cam barrel 11, and the strobe cam guide 50 follows the cam groove 11e along the optical axis (left and right in the figure).
Moving. FIG. 6 shows a shape in which the outside of the cam cylinder 11 is expanded. The area A in the cam groove 11e is the retractable area, and the area B is the shooting area. In the region B, the cam groove 11e does not change in the optical axis direction, and is displaced by C in the optical axis direction between the wide position and the retracted position. When the cam barrel 11 rotates, the cam guide 50 that has entered the cam groove 11e moves in the optical axis direction by C along the groove 11e.

FIG. 2 shows the relationship between the cam guide 50 and the shaft member (strobe rotation shaft) 108.
9A shows the positional relationship when the strobe is down (when the camera is retracted), FIG. 8B shows the strobe up completion, and FIG. 7C shows the overcharge completion positional relation after the strobe up completion. When the cam guide 50 starts to move in accordance with the above-mentioned cam groove 11e, the cam surface 50 'of the cam guide 50 and the contact portion 108' of the shaft member 108 come into contact with each other, and the shaft member 108 starts to rotate. The strobe cam guide 50 has a hole 50a in the cam barrel 1.
It is provided by the rotation of 1 and can be moved back and forth according to the guide bar 51.

The strobe cam guide 50 moves to the right in the drawing along the cam groove 11e, and at the time when the strobe device moves by X, the strobe device completes the up movement. However, if stopped at this point, there will be some variations that will complete the up, and others that will not complete the up. Therefore, it is necessary to move to the up side even after the up is completed.

However, since the strobe device has completed the up movement, it is stopped by a stopper (not shown), and only the shaft member 108 continues to rotate by the absorption spring 702 attached to the shaft. As the elastic member used here, a torsion spring that generates an axial torque is suitable. That is, the stroke Y is the amount of overcharge, and the absorption spring 702 is active during the stroke Y.

In the state (a) where the shaft member 108 and the strobe cam guide 50 are not in contact with each other, the strobe down spring 701 causes the strobe device to be in the down state.

FIG. 8 is an axial sectional view of the down spring 701. The down spring 701 is wound around the shaft member 108, one end 701 a of the down spring 701 is on the strobe housing 105, and the other end 701 b is on the strobe base plate 107.
The strobe device is urged to the down side.

Next, the absorbing spring 702 will be described. FIG. 9 is a view of an axial cross section of the absorption spring. (A) is when the strobe is down, (b) is when the strobe is completed, (c)
[Fig. 6] is a diagram at the time of overcharge after completion of strobe up. One end 702a of the absorption spring 702 wound around the shaft member 108 is hooked on the shaft member 108, and the other end 702b is hooked on the portion 105a of the strobe housing, and the protruding portion 108c and the portion 10 of the shaft member.
5a is assigned. Next, the function of the absorption spring 702 at the time of the above-mentioned up will be described. FIG. 9B is a sectional view of the absorption spring showing a state immediately after completion of strobe up. By moving the strobe cam guide 50 described above,
The entire strobe device is lifted up, and the stopper portion 901 of the strobe housing 105 comes into contact with the stopper portion 902 of the strobe base plate 107. This position is the strobe up state. Between the strobe device in the down state shown in FIG. 9A and the up state in FIG. 9B, the strobe housing 105 and the shaft member 108 are integrally rotated by the absorption spring 702. The rotation stops, and only the shaft member 108 further rotates to the up side and rotates to the state shown in FIG. 9C. This absorption spring 70
2 always generates a force to overcome the down spring 701 it is necessary keep is fixed while generating 3 to 4 times position the force down spring 701. Therefore, between FIG. 9B and FIG.
Since 2 rotates and the absorption spring 702 is charged further, the above-mentioned force is generated in the absorption spring.

(Second Embodiment) Next, a second embodiment will be described. FIG. 10 is a perspective view of a camera incorporating the mechanism of the present invention. FIG. 11 is a sectional view of the strobe portion of the camera with a built-in strobe according to the present invention. 1101 is a light emitting tube that emits strobe light. 1102 is a reflecting shade that reflects strobe light. 1103 is a Fresnel lens that collects the reflected light from the reflecting shade. It is silicone rubber. 10
Reference numeral 03 is a flash housing that holds the members 1101 to 1104. A strobe guide bar 1105 guides the strobe housing. The strobe housing 1003 can move up and down along the guide bar 1105. 1112
Is a stopper when the strobe housing is raised (projected).
Reference numeral 1106 denotes a flash guide, and the absorption spring 1108 presses the flash guide 1106 and the flash housing 1003.

From the flash guide 1106, the pin 110
6a is out. When the cam barrel 11 rotates due to the movement of the taking lens as in the first embodiment, the cam guide 1110 moves in the optical axis direction according to the cam groove 11e, and the cam guide 1 moves.
The cam surface 1110a of the cam lever 110 and the pin portion 1109b of the cam lever 1109 contact each other, and
Rotate around a. Thereby the cam lever 11
09 rotates, and the strobe guide 1106 is lifted by the pin portion 1106a of the strobe guide 1106 which is inserted into the groove 1109c. The elastic member used here is preferably one that generates tension, and a rubber or metal tension spring is used. The strobe housing 1003 that has been lowered by the down spring 1107 is the absorption spring 11 described above.
It is lifted together with the flash guide 1006 by 08. FIG. 11A shows a state in which the strobe light emitting portion is down (stored), and FIG. 11B shows a state in which the strobe light emitting portion is up (protruded). The stopper 1112 is in contact with the portion 1003a of the strobe housing 1003. ing. Then, as shown in FIG. 11C, the cam guide 1110 further advances to the right, and the cam lever 11 is attached to the cam portion 1110b of the cam guide.
It progresses until the pin portion 1109b of 09 rises. At this time, the flash housing 1003 is stopped by the stopper 1112, so the flash guide 1106
Only rises against the absorption spring 1108. Figure 11
As shown in (b), the pin portion 110 of the cam lever 1109
9b and the cam surface 1110a of the cam guide 1110 are in contact with each other, the bar 11 for guiding the cam guide 1110 is provided.
The force applied to 11 acts in the direction to stop the extension of the taking lens barrel. In addition, the cam lever 1109 of FIG.
When the pin portion of the above rides on the cam surface 1110b of the cam guide, no force is transmitted to the lens barrel.

(Third Embodiment) Next, a third embodiment will be described. FIG. 12 is a diagram showing a third embodiment of the present invention. The drive unit of the taking lens is the same as that in FIG. 5, but there is no cam groove outside the outermost cam barrel 1201 of the lens barrel for moving the flash light emitting unit shown in the above-described embodiment. A gear 1202 is engaged with the lens barrel driving gear portion 1201a, and there is a cam shaft 1204 that is decelerated and rotated by a reduction gear train 1203. The cam shaft 1204 is formed with a cam surface 1204a of a protrusion. In this embodiment, it is necessary to align the phase of the cam barrel 1201 of the taking lens barrel and the cam shaft 1204, and the phase is adjusted by changing the meshing position of the teeth of the gear portion 1201a and the gear 1202. FIG. 13 is a development view of the cam shaft 1204. As can be seen from FIG. 13, the cam surface 1204a does not change in the optical axis direction in the shooting area, but changes by C in the optical axis direction in the retracted area. Due to this change in C, the strobe device is moved up and down by the same mechanism as in the first embodiment.

FIG. 14 shows a top view and a front view when the same shaft member 108 as in the first embodiment for moving the strobe device up and down contacts the cam surface 1204a of the cam shaft. The above-described cam shaft 1204 rotates to rotate the shaft member by C. (A) shows a down state of the strobe device, (b) shows an up state, and (c) shows an overcharge state after completion of the up. In this overcharged state, the absorption spring similar to that of the first embodiment is charged.

In FIG. 14A, the projection 108a of the shaft member 108 and the cam surface 1204a of the cam shaft 1204 are not in contact with each other, and when the cam shaft 1204 starts to rotate, the projection 10
8a and the cam surface 1204a come into contact with each other and shift to the up state (state of FIG. 14B). Cam surface 12 after up state
04a further progresses, and the protrusion 108a becomes the flat portion 120.
Climb to 4b. While the protrusion 108a is in contact with the cam surface 1204a, the down force of the strobe device is applied to the camshaft 1.
The force is transmitted in the rotation direction of 204, and the force is generated in the direction in which the extension of the cam barrel 1201 for driving the photographing lens is suppressed. However, the protrusion 108 is formed by the flat portion 1204b of the cam surface.
When a comes into contact, the down force is not transmitted in the rotation direction of the shaft member 108, and therefore does not affect the rotation of the cam barrel 1201 at all.

[0031]

As described above, according to the present invention,
Since the strobe device is urged toward the storage side by the urging means, a force acts in a direction to prevent the movable lens barrel from popping out, so that the strobe device can be correctly stopped at a predetermined position when moving to the photographing position.

Further, when the energy load due to the movement of the movable lens barrel from the photographing position to the non-photographing position is large, the energy load for storing the strobe device is small, and the energy load when the movable lens barrel is moved to the photographing position is reduced. When the size is small, the energy load of the projection of the strobe device becomes large, and at the same time, the energy loads do not overlap and the energy can be dispersed.

When the strobe device is projected, the strobe device is urged to project, so that the camera user can recognize the projecting operation of the strobe device and call attention.

Further, after the strobe device is projected, the storage force of the strobe device is hardly transmitted to the movable lens barrel, and the energy loss is small.

[Brief description of drawings]

FIG. 1 is a sectional view of a flash device according to a first embodiment.

FIG. 2 is an operation diagram showing an up / down driving operation of the strobe device according to the first embodiment.

FIG. 3 is an external perspective view of a camera having a built-in up / down strobe according to the first embodiment.

FIG. 4 is a plan view of an inner surface shape of a cam barrel of a taking lens barrel.

FIG. 5 is a sectional view of a taking lens barrel.

FIG. 6 is a development view of a strobe cam portion outside the cam barrel.

FIG. 7 is a perspective view of the inside of the strobe device.

FIG. 8 is an axial sectional view of a down spring.

FIG. 9 is an axial sectional view of an absorption spring.

FIG. 10 is an external perspective view of the camera of the second embodiment.

FIG. 11 is a cross-sectional view of a flash unit according to a second embodiment.

FIG. 12 is a sectional view of a taking lens barrel according to a third embodiment.

FIG. 13 is a development view of a cam portion according to the third embodiment.

FIG. 14 is an operation diagram of a rotary shaft and a cam shaft in the third embodiment.

[Explanation of symbols]

11 cam barrel 50 cam guide 102 reflective shade 103 arc tube 105 strobe housing 108 shaft 701 Down spring 702 absorption spring 1003 strobe housing 1106 Strobe guide 1109 cam lever 1110 cam guide 1204 Cam shaft

Claims (2)

(57) [Claims] 1. A lens barrel moving mechanism for moving a movable lens barrel from a non-photographing position to a photographing position and a strobe device are provided.
The first position where the strobe device is projected and the storage method
Is supported in a freely movable manner with the second position moved in the direction,
For moving the movable lens barrel from the non-shooting position to the shooting position
By interlocking, move the strobe device from the second position to the front.
In the camera for moving to the first position , an urging means for urging the strobe device in the storing direction and a movement of the movable lens barrel from the non-photographing position to the photographing position.
When the moving member that moves in conjunction with the movement and the strobe device are in the first position,
Direction from the non-photographing position of the movable lens barrel to the photographing position
The movement of the moving member linked to the movement to the char
A second urging means that is driven by the second urging means, and the second urging means projects the strobe device.
A camera characterized by urging it in the opposite direction . 2. In the strobe device, the movable lens barrel is in front.
When moving from the non-shooting position to the shooting position
In this case, the strobe device is
Interlocks with the movement of the moving member when it is between positions
When the strobe device is in the first position,
The camera according to claim 1, wherein the camera is not interlocked with the movement of the moving member .