JPS6239383Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film confirmation device that allows the success or failure of automatic film loading in a camera to be confirmed through a display.

Loading film in a conventional camera is accomplished by first inserting the leading end of the film into a film take-up spool, then closing the back cover and taking several blank shots to set the first photographic frame.
Normally, whether the leading end of the film has been successfully wound onto the film take-up spool is determined by the load applied to the wind-up lever or the rotation of the rewind lever. However, in the early stages of film winding, the rewind lever may not rotate even if the film has been successfully wound due to slack in the film inside the cartridge. The current situation is that it is not possible.

This relies on the sense of the photographer's fingers,
This was extremely unsettling for beginners and those who did not use the camera very often. In addition, in the case of a camera that winds the film only by a motor,
Since the winding lever itself was not provided, there was no way to check it.

For this reason, in recent years, mechanical devices have been developed in which a friction member is provided on the axis of the film winding spool and the friction member vibrates during winding to notify the photographer of the film winding state, and a film winding confirmation device has been proposed by the present applicant. (Special application 1973-
89385) has been proposed. However, in the former case, the arrangement of the friction member is restricted and it is not always easy to confirm that the winding is normal. In addition, the latter may cause false confirmation due to changes in temperature and humidity or individual differences in cartridges. The present invention provides a film verification device that does not have the above-mentioned drawbacks.

In the present invention, a conductive part is formed on the outer circumferential portion of the film take-up reel that contacts the film or the backing paper, and a conductive piece is provided in pressure contact with the conductive part, so that the film being fed can enter between the two. There is provided a film loading confirmation device characterized in that at least the conductive piece is connected to a film loading confirmation circuit.

The present invention will be explained below based on the drawings.

In Fig. 1, 1 is a take-up reel installed in the film take-up chamber R of camera B. All types of reels are applicable, but the one shown is a friction take-up type reel used for automatic loading. . Reference numeral 2 denotes a conductive portion formed in a ring shape within the range that contacts the film on the outer periphery, and 3 is a movable guide plate provided in the film winding chamber R so as to be swingable, and is moved counterclockwise by a spring or the like. The movable guide plate 3 may be made of an elastic member in advance and the urging spring may be omitted. Reference numeral 5 denotes a switch base mounted on the movable guide plate 3, and has two conductive pieces 6 and 7 which are pressed into contact with the conductive portion 2 of the reel 1, respectively. The conductive pieces 6, 7 and the conductive portion 2 of the reel 1 each constitute a confirmation switch of a film loading confirmation circuit 8, which will be described later. In this case, the number of the conductive pieces 6, 7 is not necessarily two, and by connecting the conductive portion 2 to one terminal of the film loading confirmation circuit 8 by appropriate means, one of the conductive pieces 6, 7 can be connected. One can be omitted.

Now, the film loading confirmation circuit 8 may be of a type in which the indicator lamp 9 goes out when the confirmation switches 2, 6, 7 are turned off due to the intervention of the film F, as shown in FIG. It may also be of a type in which an indicator lamp 9 lights up for a predetermined period of time when the confirmation switches 2, 6, 7 are turned off by the film F as shown in the figure. In either case, 10 is a power supply, and 11 is a switch that is turned on when the cartridge is inserted into camera B.

With this configuration, when the cartridge is inserted into camera B, the leading edge of film F is placed near reel 1, the back cover is closed, and the film is wound manually or by power drive, the leading edge of film F will be After reaching the position shown in the first figure, it enters between the roller 4 of the movable guide plate 3 and the outer periphery of the reel 1. At this time, the leading edge of the film F simultaneously enters between the conductive pieces 6, 7 and the conductive portion 2 of the reel 1, so the confirmation switches 2, 6, 7 are turned OFF due to the insulating properties of the film F. Therefore, when the confirmation circuit 8 shown in the second figure is used, the indicator lamp 9, which was turned on when the cartridge was inserted, is turned off by turning off the confirmation switches 2, 6, and 7, and the film F is placed here. It can be confirmed that it has been wound around reel 1. Further, when the confirmation circuit 8 shown in FIG. 3 is used, confirmation can be made by turning on the indicator lamp 9 for a predetermined time by the delay circuit 12.

FIG. 4 shows a second embodiment. In the figure, reference numeral 13 is a conductor that is pressed against the roller 4 and is fixed to the switch base 5, and is connected to a terminal of the confirmation circuit 8.

In this case, the guide plate roller 4 is electrically conductive, the roller 4 is arranged in a position where it can come into contact with the electrically conductive part 2 of the reel 1, and the roller 4 is electrically conductive.
and the conductive part 2 of the reel 1 are each connected to a film loading confirmation circuit 8 so as to constitute a direct contact confirmation switch.

FIG. 5 shows a third embodiment, in which the conductive piece is provided on the back cover side of the camera so that the conductive part of the reel and the conductive piece come into pressure contact when the back cover is closed. .

FIG. 6 shows a fourth embodiment, in which the conductive portion is formed on the outer periphery of the take-up reel portion corresponding to the narrow portion formed at the leading end of the film.
In this case, since a detection signal can be obtained when the narrow portion at the leading end of the film reaches the position of the conductive piece, the film can be quickly confirmed.

FIG. 7 shows a fifth embodiment, in which four conductive pieces are provided, all of the conductive piece groups are connected to a film loading confirmation circuit, and the conductive part on the reel side is configured as a switch acting member for the conductive piece group. This is an example of the case. In this case, the number of conductive pieces to be provided is not limited to four, but may be more than four. By increasing the number of film detection positions in this way,
The film position can be known more accurately.

FIG. 8 shows a sixth embodiment, in which the conductive piece is constructed as a conductive roller. in this case,
Since the conductive piece is a roller, the transport of the film is not hindered by the conductive piece.

As a seventh embodiment, there is an embodiment of a camera incorporating an automatic film winding device. With a camera equipped with an automatic film winding device, it is not possible to manually determine the load on the film winding lever, so the present invention, which allows confirmation of film loading using an electrical signal, is extremely useful.

Greater effects can be obtained by appropriately combining the embodiments described above.

In the present invention, the conductive portion formed on the outer periphery of the spool does not necessarily have to be ring-shaped, and may be formed intermittently in the circumferential direction to obtain intermittent light emission. In this case, the display becomes intermittent until the film reaches the position of the conductive piece.

Further, in the present invention, the display device is not limited to one using a lamp, a light emitting diode, etc., and any known display means may be used as appropriate.

Furthermore, the present invention can also be used in the entire winding process of a camera in which the film loaded in the cartridge is completely wound onto the supply reel and then fed into the cartridge again while taking pictures.

As described above, the present invention has made it easier to confirm film loading, which has traditionally been a source of anxiety because it has relied on the sense of the photographer's fingers.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a first embodiment of the present invention, FIG. 2 is a film loading confirmation circuit, FIG. 3 is another film loading confirmation circuit, and FIG.
FIG. 5 shows the second embodiment, FIG. 6 shows the third embodiment,
FIG. 4 shows the fourth embodiment, FIG. 7 shows the fifth embodiment, and FIG.
The figure shows the sixth embodiment. 1 is the take-up reel, 2 is the conductive part, 3 is the movable guide plate, 4 is the roller of the movable guide plate 3, 5 is the switch base, 6 and 7 are conductive pieces, 8 is a film loading confirmation circuit, 9 is an indicator lamp, 10 is a power source, 11 is a switch which is turned on when the cartridge is inserted into the camera, 12 is a delay circuit, 13 is a conductor, B is the camera body, R is the film take-up chamber, and F is the film.

Claims (1)

[Scope of utility model registration request] A conductive part is formed on the outer periphery of the film take-up reel which is rotated by automatic loading and comes into contact with the film, and a conductive piece is provided in pressure contact with the conductive part so that the film to be fed can enter between the two. A film checking device characterized in that at least the conductive piece is connected to a film checking circuit.