JPS6136987Y2 - - Google Patents

Description

[Detailed Description of the Invention] The purpose of the present invention is to prevent failures in photographing due to poor flash of a camera using a strobe.

In recent years, various cameras that use strobes have been provided, but these types of cameras have the disadvantage that if a photograph is taken while the strobe is being charged, the photographing fails due to a flash failure.

The present invention was developed in order to avoid such failures while also allowing normal photographing, and its novel features are described in the claims for utility model registration.

The present invention will be explained below based on examples.

Reference numeral 1 denotes a camera body, and 2 denotes a strobe box which is provided so as to be removable from the camera body 1. All or part of a known strobe device is housed inside the strobe box. In the case of normal photography, it is placed in a recessed position within the camera body 1 as shown in the first figure, but when taking flash photography, it is configured to be located in a protruding position on the top surface of the camera body as shown in the second figure. has been done. 3 is a strobe light emitting part provided in the strobe box 2, 4 is a notch formed on the lower side of the strobe box 2, 5 is a pin installed in the strobe box 2, and 6 is a connection between the pin 5 and the camera body. A tension spring is stretched between the pin 7 fixed to the strobe box 2, and the limit pins 8 and 9 are fixed to the strobe box 2.
Reference numeral 10 denotes a switching operation member which is pivotally supported on the main body 1 by a shaft 12, and its head 10a is exposed outside the camera main body. Reference numeral 11 denotes a projection formed on the operating member, which can engage with the strobe box notch 4 as shown in FIG. 13 is a spring that biases the switching operation member counterclockwise; 14 is a support for the spring; 16 is an intermediate lever rotatably supported by its shaft 15; one end 16a of the intermediate lever is connected to the restriction pin 8 of the strobe box; 9, and the other end 16b
An interlocking pin 18 is implanted in the. Reference numeral 17 denotes an insulating switch protrusion protruding from the upper center side of the left arm of the intermediate lever 16, and the intermediate lever 16 is in the position shown in the first figure (that is, the intermediate lever position when the strobe box 2 is in the retracted position). In this case, the protrusion 17 opens the operation switches 19 and 20 of the strobe light emitting circuit, which is known per se, the strobe charging completion indicator circuit, which will be described later, and the viewfinder warning lever control circuit, and the intermediate lever 16 is moved to the second illustrated position (i.e., When the strobe box 2 is in the intermediate lever position (when the strobe box 2 is in the extended position), the protrusion 17 is activated by the operating switches 19, 20.
The related position is set in advance so that it closes. 2
Reference numeral 1 denotes a flash photography switching ring rotatably installed around the photography optical axis 0, and on its periphery, a long hole 21a extending in the radial direction that engages with the interlocking pin 18 and an aperture mechanism are installed at a distance - from the EE photography state. A cam 21b for switching to an aperture-linked photographing state is formed. 22 is a warning lever inside the viewfinder that is supported by 23. 25 is the warning lever 22 in the viewfinder.
A tension spring stretched between a pin 24 implanted at one end of the camera body 1 and a pin 26 fixed to the camera body 1 works to constantly rotate the viewfinder warning lever 22 clockwise. The other end 22a of the inside viewfinder warning lever 22 is a warning indicator member that appears and disappears inside the viewfinder 28 as the inside viewfinder warning lever 22 rotates. A magnet 27 is installed in a control circuit connected to the strobe light emitting circuit. During strobe photography, the control circuit, which will be described later, attracts the adsorption plate 22b on the warning lever inside the viewfinder until the strobe is fully charged. The warning indicator member is kept in a state of appearing inside the viewfinder, and after charging is completed, the warning lever 22 inside the viewfinder is controlled by the spring 25 to rotate clockwise to retract the warning indicator member to the outside of the viewfinder 28. Further, even when photographing without using a strobe, the above-mentioned state (the magnet current is cut off) occurs, and the warning indicator member is retracted outside the viewfinder 28. FIG. 3 shows an example of a strobe circuit used in the present invention, which includes a strobe light emitting circuit, a viewfinder warning lever control circuit, a charging completion indicator circuit, and a booster circuit. In the figure, Ne is a neon lamp indicating charging completion, B is the power supply, Tr1, Tr2
are transistors, a and a' are respective positions on the circuit, C1 is the main capacitor, X is the strobe synchro contact that is closed when the shutter is released, and D
indicates a diode, and R1 to R5 indicate circuit resistance.

Next, its effect will be explained.

[When shooting without using a flash]

In this case, since the strobe box 2 remains recessed inside the camera body 1, the operation switches 19, 2
0 is open. Therefore, the magnet 27 is demagnetized and does not attract the warning lever 22 in the viewfinder, so the lever 22 is rotated clockwise by the spring 25 and the warning indicator member is retracted from the viewfinder 28. In other words, during normal shooting, the warning mechanism in the viewfinder does not work, and the camera with a built-in strobe is always ready for shooting.

[When shooting using a strobe]

In this case, first, the switching operation member head 10a is displaced clockwise to cause the flash box 2 to protrude above the camera body 1. In other words, when the switching operation member head 10a is displaced, the protrusion 11 disengages from the notch 4 of the strobe box 2, so that the strobe box 2 is moved as shown in the second figure by the contraction force of the tension spring 6. It protrudes above the camera body 1. At this time, the restriction pin 9 provided on the strobe box 2 rotates the intermediate lever 16 counterclockwise, so that the protrusion 17 of the intermediate lever 16 separates from the operating switches 19, 20 and closes the operating switch. Operating switch 1
When 9 and 20 are closed, first the transistor Tr2
becomes conductive, current flows through the magnet 27, and the magnet 27 is excited. Therefore, the magnet 27 attracts the warning lever 22 in the viewfinder, and the warning indicator member 22a appears in the viewfinder 28 and blocks its optical path. During that time, in the strobe light emitting circuit, charge for flashing is stored in the capacitor C1, but as charging is completed, the potential difference between a and a' increases, current flows through the neon lamp Ne, and when the transistor Qr1 returns to the normal state, the transistor Tr2 becomes non-conductive. Accordingly, the neo lamp Ne indicating the completion of charging is lit, and subsequently the magnet 27 is demagnetized and the attraction to the warning lever 22 in the viewfinder is released. In other words, the warning lever 22 in the viewfinder rotates and the warning indicator member 2
2a is retracted outside the viewfinder 28 and becomes ready for photographing.

As described above, in the present invention, the warning indicator member 22a blocks the optical path of the viewfinder 28 while the strobe light emitting capacitor is being charged, so even if the flashing of the neo lamp Ne indicating the completion of charging is overlooked, the photograph may be taken due to a strobe light emission failure. This has the advantage of preventing failure.

It should be noted that the illustrated embodiment is just one embodiment, so
The method of displaying the warning sign member 22a is not restricted by this. For example, if it is desired to use a permanent magnet, a coil may be attached to the permanent magnet so that its magnetic force is neutralized by the charge completion signal.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention. Figure 1 shows the relationship between the strobe box, operating switch, and warning sign lever during normal photography, and Figure 2 shows the relationship between the strobe box, activation switch, and warning sign during strobe photography. Relationship diagram of levers. FIG. 3 shows a strobe light emitting circuit, a charging completion indicator circuit, a booster circuit, and a viewfinder warning lever control circuit. 1 is the camera body, 2 is a strobe box, 3 is a strobe light emitting part, 4 is a notch, 6 is a tension spring, 8 and 9
is a restriction pin, 10 is a switching operation member, 11 is a protrusion,
13 is a spring, 16 is an intermediate lever, 17 is a switch pin, 18 is an interlocking pin, 19 and 20 are operating switches, 21 is a flash photography switching ring, 21b is a switching cam, 22 is a warning lever in the viewfinder, 23 is a rotating shaft, 25 is a spring, 27 is a magnet, and 28 is a finder.

Claims (1)

[Scope of utility model registration request] A strobe that is built into the camera body and can be moved between an extended position for flash photography and a stowed position for normal photography, and a strobe that has a shape that can partially or completely cover the viewfinder field of view and that is located within the viewfinder optical path. It consists of a warning member that is movable between a warning sign position and a retracted position outside the optical path, a magnet that displaces the warning member, and a switch that opens and closes in conjunction with the displacement of the strobe. The warning member is moved back to the retracted position by keeping the magnet in an inoperative state in accordance with the switch means opened by the strobe in the retracted position, and the switch means is closed by the strobe in the protruding position during flash photography. The warning member is moved to the warning sign position while maintaining the magnet in an operating state, and the warning member is moved from the warning sign position only in accordance with a charging completion signal when the charge amount of the strobe charging circuit reaches a predetermined value. A warning mechanism characterized in that the warning mechanism is configured to cause the user to retreat to a retreat position.