JPS63161436A - Automatic detector for film information - Google Patents

Abstract

PURPOSE:To smoothly load a film cartridge by arranging a contact consisting of a spring material like a cantilever which is freely rocked in the radical direction of a cartridge chamber so that the free end part of the contact is abutted with the peripheral surface of the film cartridge and forming an electric contact in this free end part. CONSTITUTION:Contacts 8 and 9 consisting of spring materials like cantilevers are arranged which are protruded to a cartridge chamber 3 so that free end parts are abutted against the peripheral surface of the loaded film cartridge and are freely rocked in the radial direction of the cartridge chamber 3, and electric contacts A1 and A2 are formed in these free end parts. Since free end parts are placed on the side of a rewind shaft, contacts 8 and 9 are rocked outward in the radial direction of the cartridge chamber 3 and the corner of the film cartridge is slided toward the rewind shaft along the axis of a film winding shaft when the corner of the film cartridge is abutted with contacts from the axial direction of the film winding shaft at the time of loading the film cartridge. Thus, an obstruction due to the constitution for film information detection is resolved to smoothly load the film cartridge.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention was developed so that when a film cartridge is loaded into the cartridge chamber, film information such as the sensitivity of the film and the number of sheets can be automatically set on the camera side. The present invention relates to a device for automatically detecting information attached to a film cartridge in a DX system. Specifically, in the cartridge chamber, conductive areas and non-conductive areas are arranged on the circumferential surface of the loaded film cartridge according to a pattern corresponding to the film information, and a plurality of electrical contacts are placed in the cartridge chamber to contact the film information code section that encodes the film information. Contacts are provided, and conduction is established between these electrical contacts via the film information code section.
The present invention relates to an automatic film information detection device that is provided with a film information reading circuit that reads film information in a non-conducting state.

[Conventional technology]

The following are known as this type of automatic film information detection device.

First, as shown in Fig. 8, a plywood (18) is provided around the periphery of the cartridge chamber (3) so as to be movable in the radial direction of the cartridge chamber (3), and a pin is attached to this base plate (18). (1
9) is held so as to be able to freely swing in the radial direction of the cartridge chamber (3) and protrude into the cartridge chamber (3) so that its tip comes into contact with the circumferential surface of the loaded film cartridge (2). A spring (20) is provided to bias the base plate (18) and the pin (19) toward the patrone chamber (3), and an electric contact (A) is formed at the tip of the pin (19). (For example, Japanese Patent Laid-Open No. 158424/1983).

The other method, as shown in FIGS. 9 and 10, is to attach a contact piece (21) using a spring material to the circumference of the cartridge chamber (3) along the circumferential direction of the cartridge chamber (3). The film cartridge is provided so as to be able to freely swing in the radial direction of the cartridge chamber (3) in a posture such that it protrudes into the cartridge chamber (3) so that its free end comes into contact with the circumferential surface of the loaded film cartridge (2). This contact piece (2
An electrical contact (A) is formed at the free end of 1).
For example, Japanese Patent Application Laid-Open No. 60-22512).

[Problem that the invention seeks to solve]

However, when using the former conventional device, three components such as a pin, plywood, and a spring are required to make an electrical contact, and in addition, the pin may be removed from the plywood in the protruding direction, and the plywood may protrude from the camera body. It is necessary to have a structure that prevents the spring from coming out in any direction, and on top of that, the spring installation part becomes a narrow space between the pin, the plywood, and the camera body, and the spring assembly structure gets stuck, making the overall structure complicated. Moreover, it had the disadvantage that it was difficult to assemble.

In addition, when using the latter conventional device, an electrical contact can be provided simply by attaching the contact piece, so the structure is simple and the assembly work is superior, but the free end of the contact piece Although it swings backward in the radial direction when pushed from the radial direction of the cartridge chamber, it does not swing backward even when the free end is pushed from the direction of the core of the winding shaft, resulting in the following drawbacks.

In other words, when loading a film cartridge into the cartridge chamber, generally, as shown in Fig. 1O, the film cartridge (2) is inserted into the rewind shaft (4) and engaged with it. This involves an operation of moving the cartridge (2) in the direction of the winding axis. Therefore, when loading a film cartridge into the cartridge chamber, the corner of one end of the film cartridge slides along the circumferential wall of the cartridge chamber in the direction of the winding axis, and often comes into contact with the free end of the protruding contact piece. . However, when using the conventional device mentioned above,
Even if the corner of the film cartridge shaft comes into contact with the free end of the contact piece and presses it from the direction of the winding shaft core, it will not swing backward in the radial direction of the cartridge chamber, so that the corner of the film cartridge will not move outward in the radial direction of the cartridge chamber. It gets caught in the film cartridge and prevents loading of the film cartridge.

SUMMARY OF THE INVENTION An object of the present invention is to provide a film cartridge device that has a simple structure, is easy to assemble, and can be operated smoothly.

[Means for solving problems]

The characteristic configuration of the film information automatic detection device according to the present invention is as follows:
A cantilevered spring member is provided around the periphery of the cassette chamber, the free end of which protrudes into the cassette chamber so as to come into contact with the periphery of the loaded film cassette, and is swingable in the radial direction of the cassette chamber. The contact piece is disposed in such a manner that its free end is located on the rewinding shaft side, and the electrical contact is formed at the free end of the contact piece. The effects thereof are as follows.

[For production]

By adopting a method in which the electrical contact is formed with a contact piece, similar to the latter conventional device mentioned above, the aim is to simplify the structure and improve workability in assembly. Since the free end of the film cartridge is located on the rewinding shaft side, if the corner of the film cartridge hits the contact piece from the direction of the film winding axis when loading the film cartridge, the contact piece will fall into the cartridge chamber. By swinging outward in the radial direction, the corner of the film cartridge' can slide on the contact piece along the film winding axis toward the unwinding axis.

〔Example〕

Next, examples of the present invention will be shown.

As shown in Fig. 2, when a film cartridge (2) with a film information code section (1) formed on its circumference is loaded into a cartridge chamber (3), the camera stores the film information code section (1). Equipped with an automatic film information detection device that automatically detects film sensitivity using

The film information code section (1) consists of six code regions (El to E&) arranged in parallel along the cartridge axis, and these code regions (E, to ES) are divided into conductive regions according to the film sensitivity. Film sensitivity information is encoded by forming conductive regions and non-conductive regions and arranging the conductive regions and non-conductive regions according to a pattern corresponding to the film sensitivity as shown in Table 1.

In addition, in order to easily distinguish between the six code areas (F!, ~E6), the first code area (El
) is the first code area, the second code area (E2) is the second code area, the third code area (33) is the third code area, the fourth code area (E4) is the fourth code area, 5 The th code area (ES) will be referred to as the 5th code area, and the 6th code area (E6) will be referred to as the 6th code area.

Further, the shaded areas indicate conductive areas, the blank areas indicate non-conductive areas, and Sv is the sensitivity according to the APEX method.

Table 1 At the bottom of the patrone chamber (3), there are
As shown in Fig. 4, when the film cartridge (2) is loaded into the cartridge chamber (3), it is inserted into the non-protruding end (2B) of the winding shaft of the film cartridge (2) to prevent rotation. The unwinding shaft (4) that engages with the state is slidable in the direction of the film winding axis while penetrating a portion of the force camera body (5) that forms the bottom of the cartridge chamber (3). It is provided. This unwinding shaft (4) has a cartridge chamber (
3) is biased to the protruding position via a spring ring (6).

The film information automatic detection device includes two electrical contacts (AI), (A-rito) and these electrical contacts (A +), which contact the fourth code area (E4) of the film information code section (1). (At) and the fourth code region (E4
) and a film information reading circuit (7) that reads film sensitivity information based on the conduction/non-conduction state via the film.

The electrical contacts (AI) and (At) are shown in FIG. 1, respectively.
As shown in FIGS. 3 and 4, it is formed by the free ends of cantilevered contact pieces (8) and (9) made of conductive spring material. The contact pieces (8) and (9) project into the cartridge chamber (3) so that their free ends come into contact with the circumferential surface of the loaded film cartridge (2), and extend in the radial direction of the cartridge chamber (3). Even if it is something that moves freely and exists,
They are arranged circumferentially along the film winding axis (X) and with their free ends positioned on the rewinding axis (4) side.

The base end portion of the camera body (5) is attached to the back surface facing the exterior (10) of the portion forming the peripheral wall of the patrone chamber (3). Openings are formed for guiding the free end sides of both contact pieces (8) and (9) to the cartridge chamber (3), and an opening is formed on the exterior (10) side of the contact pieces (8) and (9). A light shielding plate (11) is attached to block and close the light. In addition, the base ends of both contact pieces (8) and (9) are attached to the base plate (12).
) is directly connected to the In other words, contact piece (8),
(9) is the electrical contact (AI), (A2) and the board (12)
It also serves as a conductor between the

As shown in FIG. 5, the film sensitivity reading circuit (7) includes two resistors directly connected to a constant current source (14) for outputting a voltage for sensitivity information to the exposure control circuit (13) of the camera. (R+) and (Rz), and the electrical contact (A
The analog switch (15), which turns off when conduction occurs between I) and (AX), and turns off when it does not, is connected to the resistor (R1),
One of the resistors (R2) (connected in parallel to Rυ, and when the analog switch (15) is turned off, the two resistors (R1) and (R2) are connected in parallel) APEX method (7) SV value tear (ISOTE 400) and when the analog switch (15) is turned on, the analog switch (15) short-circuits both ends of one resistor (R1) and connects the other resistor (R2). It is configured to output a voltage corresponding to an Sv value of 5 (ISO 100). (16) is a photometric circuit.

Therefore, when the rsoioo film cartridge (2) is loaded, the fourth code area (R4) is a non-conducting area, so there is no continuity between the electrical contacts (80 and (Ax)), and the output The voltage becomes a value equivalent to l5O100, and l5
When the film cartridge (2) of 15O400 is automatically detected and the film cartridge (2) of 15O400 is loaded, the electrical contact (A
I) and (At) conduct, and the output voltage becomes l5O4.
00 equivalent value, and it is automatically detected that it is IS 0400.

(7) is a drive gear for the rewinding shaft (4), which is connected to the rewinding shaft (4) by a vertical groove and a protrusion that fits into the vertical groove.
) is linked to the state that allows sliding.

According to the configuration of the above embodiment, as shown in FIG. 3, when loading the film cartridge (2) into the cartridge chamber (3), the electrical contacts (
A contact piece (8) forming AI), (At).

Even if it comes into contact with (9), the contact piece (8),
(9) is swung outward in the radial direction of the cartridge chamber (3) against its elasticity.
) allows the contact pieces (AI) and (At) to swing smoothly without getting caught as the film cartridge (2) moves toward the rewinding shaft (4). .

[Another example]

Another example of the present invention will be shown below.

[1] In the above embodiment, only the sensitivity of the film information is detected, but in the present invention, when detecting film information other than the sensitivity information, such as the number of boards, all of the film information is detected. It can also be applied in cases.

[2] In the above embodiment, the contact piece (AI), (A2) is made of a conductive spring material, and the electrical contact (80, (A2)
The connection between the board (12) and the contact piece (8), (9
), but the contact pieces (8) and (9) may be made of a non-conductive spring material such as plastic. In this case, electrical contacts (AI) can be made by pasting metal pieces or forming metal films on the free ends of contact pieces (8) and (9).
, (At) and its electrical contacts (AI), (A2)
This is carried out by applying conductive wires between the substrate (12) and the substrate (12).

[3] In the above embodiment, two electrical contacts (AI), (/h) that contact the fourth code region (R4) are provided, and the fourth code is connected between these electrical contacts (AI), (Ax). Sensitivity was configured to be detected based on the state of conduction and non-conduction through the region (E4), but as shown in FIGS. 6 and 7, the electrical contact (A
A contact piece (8) forming υ at the free end, and a fifth cord region (
A contact piece (9) is provided on each of the leg portions of the bifurcated free end to form an electric contact (A2) that comes into contact with E,) and an electric contact (^,) that comes into contact with the sixth cord region (E6), Then, the analog switch (15) of the film information reading circuit (7) of the above embodiment is provided so that the analog switch (15) of the film information reading circuit (7) of the above embodiment is set so that it turns 0FFL when conduction occurs between both contact pieces (8) and (9), and turns ON when there is no conduction. It may also be detected. In this case, regardless of the film sensitivity, at least one of the fifth code area (E, ) and the sixth code area (E6) is a conductive area, so the analog switch (15)
Film sensitivity can be identified as 0FFL if it is 400 or more, and ONL if it is 15O320 or less.

[4] In the above example, the film sensitivity used is 15
Focusing on the fact that O100 and l5O400, l5
The film sensitivity is 1 depending on whether it is O400 or higher.
30100 or 130400, but the present invention detects the first to sixth code regions (EliE
&) one electric contact (AI NA&) for each, or the second to sixth code areas (EX~
Ei) Two electrical contacts for each (80, (AX)
may be provided to automatically detect the film sensitivity.

〔Effect of the invention〕

In summary, according to the present invention, although the electrical contact is formed with a contact piece, the arrangement position of the contact piece is devised so that the corner of the film cartridge does not get caught on the contact piece when the film cartridge is loaded. You can avoid that.

Therefore, the film information can be detected using a structure that has a simple structure and is easy to assemble, and also eliminates the obstacles to loading the film cartridge due to the structure for detecting the film information. Loading the film cartridge can now be done more easily and smoothly.

[Brief explanation of the drawing]

Figures 1 to 5 show embodiments of the present invention, with Figure 1 being a perspective view of the main parts of the camera, Figure 2 being a side view of the film cartridge, and Figure 3 showing the loading state into the film cartridge chamber. Fig. 4 is a vertical sectional view of the main part showing a state in which the film cartridge is loaded into the cartridge chamber;
The figure is a circuit diagram. 6 and 7 are a perspective view and a circuit diagram of the main parts of a camera showing another embodiment of the present invention. 8 to 10 show conventional examples;
The figure is a longitudinal cross-sectional view of the main part, and FIG. 9 is a cross-sectional view of the main part. (3)...Patrone room, (2)...
Film cartridge, (1)...Film information code section, (AI), (ax)...Electrical contact, (7)...Film information reading circuit, (8)
, (9)...Touch piece.

Claims (1)

[Claims] 1. A film information code section for encoding film information by arranging conductive areas and non-conductive areas on the peripheral surface of the loaded film cartridge in the cartridge chamber according to a pattern corresponding to the film information. The film information automatic detection device is provided with a film information reading circuit which is provided with a plurality of electrical contacts that come into contact with each other and reads film information based on the state of conduction or non-conduction between these electrical contacts via the film information code section. A cantilever-shaped spring material is provided around the circumference of the cartridge chamber so as to protrude into the cartridge chamber so that its free end comes into contact with the circumferential surface of the loaded film cartridge, and is swingable in the radial direction of the cartridge chamber. A film information automatic detection device comprising: a contact piece disposed in such a manner that its free end is positioned on the rewind shaft side, and the electrical contact is formed at the free end of the contact piece. 2. The automatic film information detection device according to claim 1, wherein the electrical contact is the free end of the contact piece itself.