JPH0643915Y2 - Magnetic tape cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a magnetic tape cartridge, and more particularly to a magnetic tape cartridge provided with a security sensor for preventing the magnetic tape from being taken out from a computer control room, for example. .

(Prior Art) A magnetic tape of a computer often stores valuable information, and it is not preferable in terms of management that the magnetic tape be freely taken out from a storage place such as a computer control room.

Therefore, a surveillance system for theft prevention (for example, Japanese Patent Publication Sho 57
No. -24598) is used to attach a tag-shaped element equipped with a sensor that responds to specific electromagnetic waves to a magnetic tape cartridge, and when this container passes a detection area that emits the specified electromagnetic waves, the sensor for that element A device has been proposed in which a detection device detects the alarm and sounds an alarm or the like to prevent the container from being taken out. (Actual No. 64-13594) (Problems to be solved by the device) The element of the sensor used in the above device (hereinafter referred to as a security sensor) consists of a diode part (sensor body) and an antenna part, and is in a sheet shape. It is fixed to the support layer and is formed as a seal as a whole, and is attached to the inside of the casing of the magnetic medium with an adhesive layer. For the purpose of theft prevention, it is preferable that this type of security sensor should not be easily seen from the outside, and therefore it is usually provided inside the casing.

However, with such a configuration, when the case of the cartridge is opened, the security sensor attached to the inside can be confirmed, and it is possible to easily distinguish the security sensor with and without the security sensor. Therefore, there is a risk that only the items that are not attached may be stolen, and the purpose of preventing theft may not be thorough.

In addition, since the magnetic cartridge with this type of security sensor is designed to give a warning by sounding an alarm when passing through a specific area as described above, take it out before writing. However, there is a problem that the alarm will be sounded even for cartridges that have no problem.

Therefore, there is a demand for a cartridge with a security sensor that does not sound an alarm in the case of a cartridge that has no problem even if it is taken out before writing, and sounds an alarm only when a cartridge after writing is taken out.

Therefore, in the present invention, the existence of the device cannot be easily confirmed, so that the purpose of preventing theft can be thoroughly achieved.
It is an object of the present invention to provide a magnetic cartridge with a security sensor, which does not sound an alarm before writing, but sounds an alarm only after writing.

(Means for Solving the Problems) A magnetic tape cartridge according to the present invention is a magnetic tape cartridge having a rotary erroneous erasure prevention member, wherein a body of a security sensor is fixed to one of the erroneous erasure prevention member and the cartridge, The security sensor antenna is fixed to the other, and the relative position between the security sensor body and the security sensor antenna is electrically contacted by the body of the security sensor with the rotation of the erroneous erasure prevention member. It is characterized in that it is set at a position where it can be in a contacting state and a non-contacting state.

(Operation and effect) In the magnetic tape cartridge of the present invention, the body of the security sensor is fixed to one of the erroneous erasure prevention member and the cartridge, the antenna of the security sensor is fixed to the other, and the body of the security sensor and the The relative position of the antenna of the security sensor is set to a position that allows the main body of the security sensor to be in a state of being in electrical contact with the antenna and a state of not in contact with the antenna as the erroneous erasure prevention member is rotated. Therefore, by rotating the erroneous erasure prevention member, the state where the body of the security sensor electrically contacts the antenna and the function of the security sensor is activated, and the body of the sensor is electrically connected to the antenna. Select the state in which the function of the security sensor is disabled without contact. You can Therefore, it is possible not to sound the alarm before writing, but to sound the alarm only after writing.

Further, since the magnetic tape cartridge of the present invention has the security sensor built in the erroneous erasure prevention member, it is not possible to easily confirm the presence of the security sensor from the outside so that the security sensor can be prevented. The effect can be enhanced.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing the structure of a rotary erroneous erasure prevention member (write protector) 2 provided in a magnetic cartridge of the present invention, and FIGS. 2 and 3 are views of this light protector 2.
6A and 6B are cross-sectional views showing two states in the magnetic cartridge of FIG.

The light protector 2 has a large-diameter visible portion 6 at the center of a rotation support shaft 4 extending in the axial direction, and further has a large-diameter rotating knurl portion 8 below the visible portion 6 to provide a cartridge casing. It is rotatably installed within 10. A detection mark 7 is provided on a part of the side surface of the visible portion 6. The casing 10 of the cartridge is provided with an opening 11 so that the mark on the visible portion 6 can be visually recognized or optically detected from the outside, and the rotating knurl portion 8 can be operated with a finger. The knurled portion 8 can be rotated with a finger to change the position visible from the outside of the side surface of the visible portion 6. Since this structure and its usage are well known, detailed description thereof will be omitted.

A security sensor main body 12 is fixed to a lower surface 8a of the rotary knurled portion 8 below the visible portion 6 having a large diameter in the light protector 2.

The rotary support shaft 4 of the light protector 2 is rotatably supported by bearings 13a and 13b formed on the upper cartridge 10a and the lower cartridge 10b of the casing 10 of the magnetic cartridge. Then, a sensor antenna 15 made of a metal film, which is in electrical contact with the security sensor body 12, is adhesively fixed to the upper surface 14 of the bearing portion 13b (or the rib provided separately from the bearing portion 13b) of the lower cartridge 10b. .

The sensor antenna 15 is installed so as to take a position that electrically contacts with the security sensor main body 12 fixed to the lower surface 8a of the rotary knurl portion 8 and a position that does not contact with it, as the light protector 2 rotates. Has been done. That is, this sensor antenna 15 has the first, second and third
As is apparent from the figure, the lower surface of the rotary knurled portion 8
It is provided in a semicircular shape so as to face a part (eg, half) of 8a.

In the state shown in FIGS. 1 and 2, the security sensor body 12 is not in electrical contact with the sensor antenna 15, and the security sensor 15 is inoperative. In the state shown in FIG. 3, the security sensor main body 12 electrically contacts the sensor antenna 15 by the rotation of the light protector 2, and the security sensor 15 is in an operating state. Therefore, the display portion 7 of the light protector 2 is hidden from the opening 11 in the state shown in FIGS.
When the display portion 7 of the light protector 2 is moved to a position visible through the opening 11 in the state shown in the figure, the written state is not writable, that is, the carry-out prohibited state (state in FIG. 3). At this time, the security sensor 15 is activated to achieve the above-mentioned intended purpose.

As described above, in the magnetic tape cartridge of the present invention, since the security sensor 12 is built in the light protector 6, it cannot be noticed from the outside and its existence cannot be easily confirmed.

Further, since the security sensor body 12 can be brought into and out of contact with the sensor antenna 15 by the rotation of the light protector 2, it is possible to rotate the erroneous erasure prevention member by rotating the erroneous erasure prevention member. A state in which the function of the main body of the security sensor is activated and the main body of the sensor is not in electrical contact with the antenna,
It is possible to select a state in which the function of the security sensor is disabled, and do not sound an alarm before writing.
It is possible to set the alarm to sound only after the writing.

In the above embodiment, the security sensor body is
An example in which 12 is fixed to the side of the light protector 2 and the security sensor antenna 15 is provided on the side of the casing 10 of the cartridge has been described, but the opposite is true, that is, the main body 12 of the security sensor is placed on the side of the casing 10 of the cartridge. The security sensor antenna 15 having a semi-arcuate shape is provided, and the knurled portion 8 for rotating the light protector 2 is provided.
It may be provided on the lower surface of the.

[Brief description of drawings]

FIG. 1 is a perspective view showing the structure of a rotary type erasure prevention member (write protector) provided in the magnetic cartridge of the present invention, and FIGS. 2 and 3 are two states in the magnetic cartridge of the light protector 2. FIG. 2 …… Light protector (wrong erasure prevention member) 4 …… Rotation spindle, 6 …… Visible part 7 …… Mark, 8 …… Rotating knurl part 10 …… Cartridge casing 12 …… Security sensor body 13a13b …… Bearing 15 ... Security sensor antenna

Claims (1)

[Scope of utility model registration request] 1. A magnetic tape cartridge provided with a rotary type erroneous erasure prevention member, wherein a body of a security sensor is fixed to one of said erroneous erasure prevention member and said cartridge, and an antenna of said security sensor has said erroneous erasure prevention member. And the other side of the cartridge, which is provided at a position that can face the main body of the security sensor, and the relative position of the main body of the security sensor and the antenna of the security sensor is set in accordance with the rotation of the erroneous erasure prevention member. A magnetic tape cartridge characterized in that the main body of the sensor is set at a position where it can be brought into a state of being in electrical contact with the antenna and a state of not being in contact with the antenna.