JPH058780U - Tape cartridge - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent malfunction of tape end detection by optical detection method. [Structure] The light emitter 9 and the light receiver 1 on the inner surface of the main body case 1
An area facing the tape end detection optical path 13 connecting 0 is formed on the matte surface 14. As a result, when the light from the light emitter 9 hits the matte surface 14 of the main body case 1, it is diffusely reflected and dispersed, so that it can be prevented from getting into the light receiver 10, and the malfunction of the end detection of the tape 2 can be prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 There are two methods of detecting the end of the tape by the optical detection method, which are provided in the DAT or video tape cartridge, using a prism and a method not using the prism. The present invention detects the tape end without using the prism. The present invention relates to a tape cartridge equipped with a mechanism.

[0002]

[Prior Art]

 For example, FIG. 4 shows a tape end detection mechanism when the prism of the DAT tape cartridge is not used. There, the deck side light emitting device 9 is placed in the main body case 1, and the end detection of the tape 2 is performed by the light receiving devices 10 arranged on the left and right outer sides of the main body case 1.

[0003]

[Problems to be solved by the device]

 However, the main body case 1 is a plastic molded product, and the entire inner surface thereof is mirror-finished, and the region facing the tape end detection optical path 13 connecting the light emitter 9 and the light receiver 10 is also the same.

Therefore, paying attention to the tape end detection optical path 13, the area where the light from the light emitter 9 should be blocked by the magnetic tape portion of the tape 2 faces the tape end detection optical path 13 on the inner surface of the main body case 1. The reflected light leaks from the gap between the inner surface of the main body case 1 and the upper end or the lower end of the magnetic tape portion as shown by a broken line A, and leaks into the optical receiver 10. This causes a malfunction of the tape end detection. Was sometimes invited. At any rate, such a problem becomes noticeable when the main body case 1 is colored in a whitish color that easily reflects light.

An object of the present invention is to prevent the above-described reflected light from the inner surface of the main body case from causing a malfunction of the tape end detection in the tape cartridge equipped with the tape end detection mechanism. ..

[0006]

[Means for Solving the Problems]

 As shown in FIG. 1, the present invention is characterized in that a matte surface 14 is formed on the inner surface of the main body case 1 so as to face the tape end detection optical path 13 connecting the light emitter 9 and the light receiver 10. To do.

[0007]

[Action]

 When the light from the light emitter 9 hits the matte surface 14 of the main body case 1, the light is diffusely reflected and scattered.

[0008]

[Effect of the device]

 Therefore, according to the present invention, even if the detection light of the magnetic tape portion of the tape 2 leaks from the gap between the inner surface of the main body case 1 and the upper end or the lower end of the magnetic tape portion, it is prevented from entering the light receiver 10. Since it can be suppressed, it is possible to prevent the malfunction of the end detection of the tape 2 from occurring. Moreover, the matte processing of the inner surface of the main body case 1 requires only a part of the molding die surface to be processed into fine irregularities, etc., and the number of steps is smaller than that of attaching an antireflection film, and the cost is low. it can.

[0009]

【Example】

 An embodiment in which the present invention is applied to a tape cartridge for DAT will be described based on FIG. 1 and FIG. In FIG. 1 and FIG. 2, the main body case 1 has upper and lower plastic cases 1a and 1b that are butted against each other and integrally connected by screws or the like. Hubs 3, 3 around which the tape 2 is wound are rotatably housed on the left and right sides of the inside of the body case 1.

In FIG. 1 to FIG. 3, a tape loading pocket 4 is provided in the center of the front side of the main body case 1, and tape outlets 5, 5 are provided on the left and right of the pocket 4, respectively. The tape 2 is led out from one hub 3 to the front side of the case through the tape outlet port 5 in front of it, passes through the pocket 4 and is introduced into the other tape outlet port 5 to the hub 3 behind it. It is rolled up. A front lid 6 is pivotably attached to the front side of the main body case 1 so as to be openable and closable, and the front leading portion of the tape 2 is covered and protected by the front lid 6 when not in use. A slider 7 for opening and closing the bottom side of the pocket 4 is mounted on the bottom of the body case 1 so as to be slidable in the front-rear direction, and the bottom side of the pocket 4 is closed when not in use.

An end detection mechanism for the tape 2 is provided inside the main body case 1. When this tape cartridge is loaded on the deck, the front lid 6 is opened and the slider 7 is slid backward, so that the light emitter 9 on the deck side is placed in the pocket 4 and the light receiver 10 is placed on the left and right outside the main body case 1. The light emitted from the light emitting device 9 is detected by the light receiving device 10. Therefore, openings 11 and 12 for passing the light from the light emitting device 9 toward the light receiving device 10 are opened on the pocket surface side and the outer surface side of the tape outlet 5, respectively, and the tape end detection optical path 13 is formed. And the tape 2 runs across the optical path 13. A transparent leader tape is connected to the beginning and the end of the magnetic tape portion of the tape 2, and the light receiver 10 detects that the leader tape reaches the tape end detection optical path 13 The end can be detected.

In the tape cartridge having the tape 2 end detection mechanism, in the present invention, a region of the inner surface of the main body case 1 facing the tape end detection optical path 13, that is, the tape outlet 5 of the main body case 1 is provided. The inner surface of the upper case 1a that covers the upper and lower surfaces and the upper portion of the pocket 4 is formed into a rough matte surface 14 by forming a fine uneven surface such as a satin finish.

As a result, when the magnetic tape portion of the tape 2 is detected, diffuse reflection occurs in which light from the light emitting device 9 is scattered in various directions even when it hits the matte surface 14 on the inner surface of the body case 1, so that It is possible to prevent the light from leaking through the gap between the inner surface and the upper end or the lower end of the tape 2 and getting into the light receiver 10. Even if the light is diffusely reflected and travels toward the light receiver 10, the amount of the light beam is extremely small. is there. Therefore, the detection of the end of the tape 2 does not cause a malfunction.

In addition to DAT, it can be similarly applied to tape cartridges such as VHS and 8 mm video.

[Brief description of drawings]

FIG. 1 is an internal plan view of an upper case.

FIG. 2 is an internal plan view of a lower case.

FIG. 3 is a vertical sectional front view.

FIG. 4 is a vertical sectional front view of a conventional tape cartridge.

[Explanation of symbols]

 1 Main body case 2 Tape 3 Hub 4 Pocket 5 Tape outlet 9 Light emitter 10 Light receiver 13 Tape end detection optical path 14 Matte surface

Claims (1)

[Claims for utility model registration] [Claim 1] A hub 3 around which the tape 2 is wound in the main body case 1, and an end detection mechanism for the tape 2 are provided, and the end detection mechanism is on the deck side entering the main body case 1. Light emitter 9
In the tape cartridge configured to detect the light from the through the tape 2 by the light receiver 10 arranged on the left and right outer sides of the main body case 1, the light emitter 9 and the light receiver 10 on the inner surface of the main body case 1 are The area facing the tape end detection optical path 13 to be connected is the matte surface 1
4. A tape cartridge characterized by being formed in 4.