JPS58203653A - Display for prevention of miserasion - Google Patents

Abstract

PURPOSE:To inform early the propriety for erasion or writing of recording to a photographer, by displaying the set state of a miserasion preventing means in a container for recording medium at a display part at a stage when said container is loaded into a recording device. CONSTITUTION:A display lever 23 is shown in the figure. This lever 23 is energized clockwise by a spring 26 and round a shaft 25. An end 23a of the layer 23 always touch the 3rd arm 18c of a detecting lever 18; while the other end 23b is attached with a display panel 27. When the lever 18 is turned more, the lever 23 turns clockwise. Then the panel 27 moves up to a position 27' shown 1-dot chain lines in the figure and enters an optical path. Thus the photographer can understand that a cassette to which a miserasion preventing means is set has been loaded.

Description

Detailed Description of the Invention: This invention is based on whether or not a means for preventing accidental erasure is set in a recording or reproducing device using a recording medium from which recorded information can be erased, particularly a recording medium such as a magnetic sheet or magnetic tape. Please refer to the full display device.

Background Art Recording media such as magnetic sheets or magnetic tapes have the great advantage of being able to once record friendship information, erase it, and then record other information.

However, due to this advantage, there is a risk of an accident in which the entire recorded valuable information is erased or information is written twice. Conventionally, in order to prevent this type of accident, the magnetic recording medium is placed in a storage container such as a cassette, and a means for preventing erroneous erasure or double recording is installed in this storage container.
Preventive measures have been taken, such as prohibiting erroneous erasure or double recording in the recording or reproducing device (for example, by disabling the operation of the record button).

By the way, in the conventional accidental erasure prevention measures, after an operator accidentally loads a recording medium storage container in which an accidental erasure prevention means is set into a recording or reproducing device f (hereinafter abbreviated as a recording device), the entire recording is When you are about to do so, the recording device cannot be set to recording mode, so it is often the case that you realize for the first time that the recording medium storage container, which is equipped with an accidental erasure prevention mechanism, is fully loaded. is.

With conventional recording devices, it is not possible to determine the status of the loaded recording medium storage container until the recording mode is set, which is inconvenient when urgent recording is required, especially when recording image signals such as still images or moving images. With regard to video camera devices for recording, there is a risk that a single conventional device may miss a so-called photo opportunity, which reduces the sense of entertainment.

Purpose of the Invention The present invention eliminates the drawbacks mentioned in E of the conventional apparatus, and loads a recording medium storage container into a recording apparatus. At this stage, the setting state of the accidental erasure prevention means in this storage container is displayed on a display section. Accordingly, it is an object of the present invention to provide a display device for preventing erroneous erasure, which can notify a photographer at an early stage whether recordings can be erased or written.

Structure of the Invention The present invention provides a detection unit that detects the setting state of an erroneous erasure prevention means (for example, whether an erroneous erasure prevention claw is removed or not removed) in a recording medium storage container (for example, a cassette). (for example, a detection lever); a display section (for example, an optical finder or an electronic finder); and, in response to the operation of the detection section, the installation state t of the accidental erasure prevention means in the recording medium storage container is displayed on the display section. The present invention is characterized by a display device for preventing erroneous erasure, comprising means for: and;

The citation of specific examples described later in the above description does not limit the scope of the present invention in any way, and the present invention can be modified as appropriate within the scope of the claims.

In the above, in order to display the setting status of the erroneous erasure prevention means on the display unit, there are two ways to display the setting state of the erroneous erasure prevention means: A2, a mode that displays that the erroneous erasure prevention means is set, a mode that fully displays that this is not specified, or a mode that completely displays that this is not specified. This includes modes in which different displays are made for each of the two cases, and the front dpi display can be audible as well as visible.

Hereinafter, a display device for preventing erroneous erasure that embodies the present invention will be described with reference to the drawings.

The following description is about the means for preventing erroneous erasure in the recording medium storage device VC, the detection section and related parts in the display device for preventing erroneous erasure of the present invention, the display section and related parts, and the method of the present invention displayed on the electronic viewfinder. I will explain the accidental erasure prevention means in the recording medium storage container in the order of other specific examples (Fig. 1 and 2). In Figure 10, 1 is a cassette, 2 is a magnetic belt, la is a so-called accidental erasure prevention claw, and lb
Reference numeral 2a denotes an opening for disposing a magnetic head (not shown), and 2a denotes a shaft mounting portion for penetrating the magnetic sheet drive shaft, which is provided at the center of the magnetic sheet 2. As shown in FIG. Or double writing can be prohibited. On the other hand, if the cassette 1 with the claw 1a attached is loaded into the recording apparatus, erasing or writing is impossible. Since the means for this purpose are common knowledge, we will omit the explanation entirely. Note that 1c in Figure 2 is claw 1.
This shows the concave portion after a is removed.

5) The recording device equipped with a display device for preventing erroneous erasure shown in FIGS. 3 to 5 does not record data when it is closed to the cassette storage@x22 main body 10, as shown in FIG. Or playback is performed.

In FIG. 3, 1 is a cassette as an example of a recording medium storage container, to is the main body of the recording device, 11 is a shaft, and 12 is a cassette storage part.

Reference numerals 1 and 13 which are pivotally supported on the main body 10 by a shaft 11 are springs, and the cassette storage portion 12 is loaded clockwise 12 from the direction of arrow A.

18Vi detection lever, which is biased in the direction of the hour hand by a spring 20 around a shaft 19. Its first arm 18a detects the presence or absence of the claw 1a on the cassette 1, and the second arm 18b detects the presence or absence of the claw 1a on the cassette 1. The third arm 18c is pressed against one end 15b of the lever 15, and the third arm 18c is pressed against one end 23 of a display lever 23, which will be described later.
It is in contact with a. The intermediate lever 15 is biased counterclockwise around the shaft 16 by a spring 17, but in the state shown in FIG. Due to its power, it maintains its third position. Therefore, the detection lever 18 is also biased counterclockwise and maintained at the position tIt shown in FIG. Note that the biasing force of the spring 13 needs to be greater than the biasing forces of the springs 17 and 20. Reference numeral 22 denotes a bottle that restricts the rotation of the intermediate lever 15 in the i1 direction when it is released. One end 23a of the built-in display lever 23 is configured to always follow the third arm 18c of the detection lever 18. .

1'l'l release switch 24 has its contact pieces 24a, '24
When b is open, the magnetic sheet 2 can be erased or written by a magnetic head (not shown), but when the inscribed piece is closed, erasing or writing is prohibited. connected. The third arm 18c of the detection lever 18 opens and closes the inscribed piece.

In the above configuration, when the cassette 1 from which the accidental erasure prevention claw 1a has not been removed is installed in the cassette storage section 12 and the cassette 1 is closed to the main body 10 as shown in FIG. part 12a and one end 1 of the intermediate lever 1'5
Since the pressing contact with 5a is released, the intermediate lever 15 rotates counterclockwise due to the bias of the spring 17, comes into contact with the bin 22, and stops. As the intermediate lever 15 rotates, the detection lever 18 also rotates clockwise due to the bias of the spring 20, and its first arm 18m is connected to the accidental erasure prevention claw 1a of the cassette 1.
3, which stops the rotation when it comes into contact with the switch 24.
Since the contact pieces 24a and 24b are in an open state,
Erasing or writing on the magnetic sheet 2 is performed by OT.

On the other hand, as shown in FIG.
When the removed cassette 1 is loaded into the binocular storage section 2 and closed against the main body 10, the first arm 18a of the detection lever 18 falls into the recess IC from which the claw 1a was removed, and therefore the detection lever 18 rotates further clockwise than the state shown in FIG. 4, and the contact piece 24a of the switch 24
, 24b are closed, erasing or writing on the magnetic sheet 2 is prohibited. The rotation of the detection lever 18 is restricted by the Fi pin shown in FIG. 5 when no cassette is stored in the storage section 12.

Regarding the display section and related parts in the display device for preventing erroneous erasure of the present invention (Fig. 6) In Fig. 6, 23
is a display lever, which is biased clockwise by a spring 26 around a shaft 25, and one end 23a thereof is always in contact with the third arm 18c of the detection lever 18 as described above. On the other hand, a 423bKi display board 27 is attached. 31 is a photographing lens, 32 is a finder, and 33 is an image sensor.

When the detection lever 18 is in the position shown in FIG. 3 or FIG. 1, the display plate 27 is positioned outside the optical path of the finder 32, so that even if the photographer looks through the finder, he or she can confirm the display 27. I can't do anything. On the other hand, when the detection lever 18 is further rotated as shown in FIG. 5, the display lever 23 is rotated clockwise, and the display plate 27 attached to -1423b is displayed as indicated by the dotted chain line in FIG. The camera moves to the point indicated by 127' and enters the optical path, so the photographer knows that a cassette with a mechanism to prevent accidental erasure has been loaded. In the case of an eye reflex optical system, it is also possible to display the image in the finder optical path. In addition, an electric switch is placed in place of the display lever 23, and a contact piece of the electric switch, such as a light emitting diode, is used instead of the display plate 27 to directly detect whether or not the accidental erasure prevention claw 1a has been removed. Another embodiment of the present invention in which the display is displayed on an electronic viewfinder that can also operate the above-mentioned display (FIG. 7) FIG. 7 An electronic viewfinder such as an Fi cathode ray tube or a liquid crystal matrix is used as the display. This is a specific example of this invention. 7th
In the figure, the output current of the imaging cable 33 is amplified by a processing circuit 51, converted into a video signal suitable for recording, passed through a control circuit 52 and a recording circuit 55, and is recorded on the magnetic sheet 2 by a magnetic head 56 in the recording mode. Ru.

The output of the force control circuit 52 is supplied via a drive circuit 53 to an electronic viewfinder display section 54 made of, for example, a liquid crystal matrix.

Here, the cassette 1 from which the accidental erasure prevention claw 1a has been removed
When the video signal is loaded, it is detected by a detection unit such as the detection lever 18, and a signal indicating this is transferred to the control circuit 52, and the control circuit 52 blocks the supply of the video signal to the recording circuit 55 [7] , erasing or writing by the magnetic head 56 is prohibited. Along with this, 1I1 of the display section 54
2. A display indicating that a cassette equipped with an erroneous erasure prevention means is loaded is displayed over a part or the entire surface of the box 11.2. This allows the erroneous erasure prevention signal to be displayed more reliably. In addition, in this specific example, when the via erasure prevention claw 1a is removed, the electronic 7-inder display section 54 shows the following information:
It is easy to make one display and then modify it to display another display when the -1 claw 1a is not removed.

Effects of the Invention Since the present invention has the above-described structure and operation, when a recording medium storage container in which the erroneous erasure prevention means is set is loaded into a recording or reproducing apparatus, the recording medium storage container is inserted into the recording medium before the photographer starts the recording operation. Since it is possible to provide an indication regarding the status of storage capacity, the time for recording even urgent records is not missed. For example, when applied to a video camera, so-called shutter timing is not missed. Furthermore, if you display the above display in the finder,
Display can be performed more reliably, and the operability of the recording or reproducing apparatus can be improved. ,

[Brief explanation of the drawing]

FIGS. 1 and 2 are perspective views of a magnetic/tooth storage container with and without an accidental erasure prevention claw, respectively, and FIG. Figures 4 and 5 are explanatory diagrams of the operation of the device shown in Figure 3, and Figure 6 is a side view showing the detection section and related parts of the device. A perspective view showing a display unit and related parts of a display device for preventing erroneous erasure embodying A, iA71
A (tir) is a schematic diagram of 1.11 of the display device for 7J+h for accidental erasing of this invention. In the figure, 1 is 1), la & ma accidental erasure prevention claw, 2 is magnetic Sheet 10 is the main body of the recording or reproducing device. 12 is the cassette storage section, 13+'l: spring, 15 is the middle 1
LIJ lever, 18i, j detection"-+23fd display lever, 24 is a switch, 27 is a display board, 32Fi finder, 54 is an electronic finder display section, and 56 is a magnetic head.

Claims (1)

[Scope of Claims] (1) A detection unit that detects the setting state of the erroneous erasure prevention means in the recording medium storage container; a display unit; Means for displaying the setting state of the erasure prevention means on the display section, and a display device 0 for preventing erroneous erasure that includes a metal part.
(O) When the display section is an optical finder, the display device for preventing accidental erasure according to the range (1) of r+observation:) (3) Claim (1) wherein the display section is an electronic finder. A display device to prevent accidental erasure of information. (4) The display device 0 for preventing accidental erasure according to claim (1), wherein the display section is an audible display section.