JPS6017729A - Information reader of camera - Google Patents

Abstract

PURPOSE:To reduce the possibility of misoperation of a titled reader, and to make a user understand it very easily by sending a warning so that film sensitivity information is set manually, in case a cartridge having no film sensitivity information is loaded. CONSTITUTION:In case a film sensitivity automatic setting mode is set and a cartridge having no film sensitivity information is loaded, since a non-conductive substance is applied to all contacts 1a-1d of the cartridge and contact groups 2a-2d are all in a non-conducting state, the outputs of invertors 6b-6d attain to all L and the output of an OR gate 8 attains to L. Also, since a switch 4 is opened, the output of an invertor 6 attains to L, as well. Therefore, the output of an NOR gate 9 attains to the H, a warning circuit 10 operates, an LED24 is lighted, and a warning is given to a user.

Description

[Detailed Description of the Invention] (Double work, 6 pieces!) The present invention proposes a technology that automatically captures this information using a camera patrone information reading device and a detection device provided on the camera side. has been done.

Such a system is very effective because it eliminates the problem of incorrect setting of film sensitivity due to photographer's mistake.

On the other hand, in such a system, the sensitivity setting is automatically performed when a film sensitivity cartridge is loaded, and some kind of warning means is operated to prompt manual setting of the film sensitivity when a cartridge without film sensitivity information is loaded. is preferred.

However, if the configuration is simply configured as described above, when the film sensitivity setting dial is in automatic set mode, even if the cartridge is not loaded, a warning will be issued in the same way as if a cartridge without film sensitivity information is loaded.
(F) is the camera body, and (F) is the film. . The side of the film cartridge (F) has sensitivity information patterns (Ia-l).
d), and on the camera (Ca) side, contacts (22 to 2d) are provided at positions corresponding to the respective patterns when the film (F) is loaded. Among the sensitivity information patterns (la to ld) of the film (F), (
1a) is a grounding pattern that is provided for any film of any sensitivity, and is always in conduction with the contact (2a) no matter what film sensitivity is loaded in the camera. The other patterns (lb to ld) are coated with a non-conductive material depending on the e-lumen sensitivity, and form the information of the patterns (lb to ld). Note that in a film having film sensitivity information, none of these 3-bit information signals are all in a non-conductive state. Further, in a film (conventional film) having no film sensitivity information, the portions located at (la to ld) are all covered with a non-conductive material. That is, all of these portions (la to ld) are in a non-conductive state.

Next, in Fig. 2, the contact portions (21 to 21) on the camera (Ca) side
2d) will be explained. Contacts (2a) (2b) (2c
) (2d) is provided on the camera (Ca) so as to be able to slide in the axial direction, and the contact pieces (3a) (3b) (3c)
(3d) is a constant contact point (28) due to its own biasing force.
~2d) is in contact with the rear end. That is, the contact point (28-2
d) is biased by contact pieces (3a to 3d) in a direction in which pressure is applied to the film cartridge. Among these, another contact piece (4) is in contact with the contact piece (3a) corresponding to the grounding pattern (1a). This contact piece (3a) and contact piece (4)
The relationship is such that when the film cartridge is loaded into the camera, contact between the two is cut off (OFFL), and at other times, both are in contact (ON). - Next, the electric circuit of this embodiment will be explained with reference to FIG. Among the contacts (22 to 2d), (2a) is grounded, but the other contacts (2b to 2d) are connected to the film (F
) is not loaded in the camera, use the film cartridge (
Since the ti points (la to 1d) of F) do not contact the contacts (28 to 2d), all outputs of the inverter group (6b to 6d) are performed.

The output of this inverter group (6b to 6d) is sent to the decoder (7
) and is also input to the OR gate (8).

The switch (4) switches the film (F) as explained in Figure 2.
) is loaded into the camera and the contact piece (3a) is inserted through the contact (2a).
) is a switch that opens when pressed, and is also connected to a pull-up resistor (5a). NOR gate (
9) uses the output of the OR gate (8) and the signal from the switch (4) via the inverter (6a) as human power, and the output becomes the input of the warning circuit (10). This warning circuit (1
0) is configured so that when the output from the NOR gate (9) is H, the connected LED (24) lights up to give a warning.

Film sensitivity information from the decoder (7) or manual cent circuit (12) is transferred to the exposure control circuit (13) via a switch (11). A switch (11) is a switch for switching between an automatic film sensitivity setting mode (hereinafter referred to as A mode) and a manual film sensitivity setting mode (hereinafter referred to as M mode). This switch (11) transmits film sensitivity information automatically read by the decoder (7) in the A mode from the decoder (7) to the exposure control circuit (13). Then, in the M mode, film sensitivity information set by the film sensitivity setting dial is transmitted from the manual setting circuit (12) to the exposure control circuit (13) as before. At this time, the film sensitivity information given on the cartridge is ignored. The exposure control circuit (13) is connected to a decoder (7) or a manual cent circuit (1).
2) This is a circuit that controls exposure based on film sensitivity information sent from. Further, (14) is a switch that is linked to the selector switch (11) and is turned off when in A mode and turned on when in M mode.

The mechanism for switching between the A mode and M mode is shown in FIGS. 4 and 5. In FIG. 5, (20) is a rewind knob, (21
) are film sensitivity setting dials, which are rotatable on a bush (25) fixed on the base plate (26) of the camera body.

(22) is a fixed ring, and a part of it is a display window (22).
a) is opened. (23) is the A-M switching ring, and the convex part (23b) extending downward is connected to the switch (1).
1) and switch (14). The upper protrusion (23a) is shown in Fig. 5 when switched to A mode.
As shown in FIG. 4(b), the convex portion (23a) is retracted from the display window (22a) so that the display window (22a) is covered from the inside when the mode is switched to M mode. As shown in the figure, the side surface (21a) of the film sensitivity setting dial (21) can be seen through the display window (22a).

A number (21b) indicating the film sensitivity to be set is displayed on the side (21a) of the film sensitivity setting dial (21), and the user can enter the value in the display window (21) when in M mode.
It is possible to set the film sensitivity while checking from 2a). The manual setting circuit (12) described above opens the display window (22a) according to the rotational position of the film sensitivity setting dial.
) is converted into an electrical signal by known means such as a variable resistor. This electrical signal is transferred to the exposure control system via a switch (11). Also the fourth
(24) shown in Figures (a) and (b) is a warning LED.

Next, the operation of these systems will be explained.

First, a case will be described in which the A mode is set and a cartridge with film sensitivity information is loaded.

4 and 5, the user is on the right side and the A-M switching knob (23
) to the "A" side, the letters rAJ printed on the convex part (23a) will appear in the display window (22a) and cover the film sensitivity value for manual setting (21a) inside, indicating that the mode is A. show. Also, in Figure 3, the switch (
11) is switched to the rAJ side, and the switch (14) is switched to the open state.

In FIG. 3, when the film cartridge * (F) is loaded, among the contact groups (2b to 2d), the contact on the cartridge formed according to the film sensitivity (in this example, the contact on the cartridge (1c)) Only the contact (2c in this example) that is in contact with the film (only (2c)) is grounded via the contact (la) (2a) which is always in a conductive state in any film.

Therefore, the inverter output corresponding to that contact ((2C) in this embodiment) changes from L to H and is input to the decoder (7). The decoder decodes the signals sent from these contact groups (2b to 2d).

In other words, in the case of this embodiment, the contacts (2b) (2c) (
2d), H and L signals are sent, and the decoder (7) decodes these signals. Also, OR gate (8
) is small and one of them becomes H, so the output of this gate (8) changes from L to H, and the output of NOR gate (9) becomes L regardless of the other input, so the warning circuit does not operate. .

The decoded film sensitivity information is transferred to the exposure control circuit (13) via the switch (11).

? ``The exposure control circuit (13) automatically sets the film sensitivity based on the signal sent from the decoder F (7), and performs exposure control based on this film sensitivity.

Next, a case will be described in which the A mode is set and a cartridge without film sensitivity information is loaded.

At this time, the contacts (la to ld) of the cartridge are all coated with a non-conductive material, and the contact groups (28 to 2d) are all in a non-conducting state, so the outputs of the inverters (6b to 6d) are all L, and the OR gate The output of (8) becomes L. Further, since the switch (4) is opened, the output of the inverter (6a) becomes L as well. Therefore, the output of the NOR gate (9) becomes H, the warning circuit (10) is activated, and the LED (24)
lights up to give a warning to the user.

At this time, when the user switches the A-M changeover knob (23) to the "M" side, the changeover switch (11) goes to the rMJ side and the switch (14) closes, so the inverter (
The output of 6a) becomes H and the output of NOR gate (9) becomes L.
The alarm circuit becomes inactive and the output of the film sensitivity manual center circuit (12) is switched to the exposure control circuit (13).
will now be entered.

Next, the case where the film cartridge (F) is not loaded will be described. In this case, the switch (4) is ON and the output of the impark (6a) is H, so the NOR gate (
The output of 9) is always L, the warning circuit is not activated, and no warning is issued.

In the above-mentioned embodiment, the warning circuit is configured to give a warning by lighting up the LEI, but the present invention is not limited to this, and the warning circuit can warn the user by activating the release locking means and the display erasing means. Needless to say, the structure may be configured to encourage this.

(Effects of the Invention) As described above, according to the present invention, when a cartridge that does not have film sensitivity information is loaded in a device capable of reading film sensitivity information provided on a cartridge, a warning is given to manually set the film sensitivity information. Therefore, the risk of erroneous operation is reduced, and since unnecessary warnings are not issued if the cartridge is not loaded, it is possible to provide a camera that is extremely easy for the user to understand.

[Brief Description of the Drawings] Figure 1 is an external perspective view of the embodiment device, Figure 2 is a perspective view showing the configuration of the contact section in Figure 1, Figure 3 is an electric circuit diagram, and Figure 4 is the film sensitivity. FIG. 5 is a perspective view showing the setting section, and FIG. 5 is a sectional view thereof. Applicant: Nippon Kogaku Kogyo Co., Ltd. Agent: Takashi Watanabe

Claims (1)

[Claims] A first mode in which a signal placed on a film cartridge can be electrically read, and a second mode in which information necessary for photographing can be arbitrarily set regardless of the signal. A camera information setting device having the following modes: a switching means for switching between the first and second modes; a first identification means for identifying whether or not a film is loaded; It has a second identification means for identifying, and a warning means, and is in the first mode, the first identification means detects that the film is loaded, and the second identification means detects the information on the cartridge. An information reading device for a camera, characterized in that a warning means is operated only when detecting the absence of a camera.