JPH04111065U - tape cassette - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to provide a tape cassette in which the problems of warping and sink marks are solved. [Structure] A tape cassette comprising an upper half and a lower half each having a transparent window, the tape cassette having a hollowed out portion in the top plate portion of the upper half.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention applies to tape cassettes used in recording and/or playback devices, e.g. For example, it relates to a tape cassette for 8mm video.

0002

[Background of the idea]

Conventionally, recording and/or reproducing devices such as video tape recorders (hereinafter simply referred to as recording and reproducing devices) It is well known that tape cassettes are used in production equipment. In addition, to outline such tape cassettes, they are generally made of plastic. A supply reel and a take-up side are located inside the main body of the case, which is made up of an upper half and a lower half. and a predetermined diameter between the supply reel and the take-up reel. The path is covered with magnetic tape, and there is also a magnetic tape located outside the case body. Equipped with a front lid to protect the loop.

0003 By the way, the top plate of the upper half has a relatively thick thickness (approximately 1.4 mm) with no unevenness. Because of this, there was a problem of warping during the molding stage. Furthermore, if the wall thickness is made thinner to solve the problem of warpage, problems with mechanical strength will occur. When ribs are formed, sink marks (occurred during plastic molding, and the material (surface dents) caused by shrinkage of the resin as it cools and solidifies. However, mere thinning means or rib forming means cannot solve the above problems.

0004

[Disclosure of invention]

The purpose of this invention is to provide a tape cassette that solves the problems of warping and sink marks. That is. The object of the present invention is to provide a television comprising an upper half and a lower half each having a transparent window. cassette, characterized in that a hollowed out portion is formed in the top plate portion of the upper half. This is accomplished by using a tape cassette.

[0005] In other words, the warpage that occurred in the top plate part of the upper half during the molding stage is due to the thickness of the top plate part. Although it was found that the problem could be solved by making the wall thinner, However, as a result of further consideration, we found that the hollowed out part It was found that the problem of warping and sink marks could be solved by adopting this structure. So Therefore, this means of lightening configuration saves the amount of resin used and reduces the amount of tape used. The cost of the puka set becomes low.

[0006]

【Example】

1 and 2 show a first embodiment of the tape cassette according to the present invention. 2 is a perspective view of the whole, and FIG. 2 is a sectional view of the upper half. The case body 1 constituting the tape cassette A is made of polypropylene, ABS, etc. , consists of a rectangular upper half 1a and a lower half 1b made of synthetic resin such as PS. The upper half 1a and the lower half 1b are fitted together from above and below, and secured with set screws. It is screwed together to form an integrated housing.

[0007] Inside the case body 1 are a pair of tape reels, namely a supply reel 2a and a take-up reel. The side reel 2b is rotatably stored, and the magnetic tape (hereinafter simply referred to as tape) 3 is It is wound and stretched between the supply side reel 2a and the take-up side reel 2b. In addition, both - The reels 2a and 2b are placed on the bottom plate of the lower half 1b, and their lower ends are placed on the bottom plate of the lower half 1b. It is positioned by being fitted into a reel fitting hole provided in the face plate.

[0008] 4 is a presser spring for the pair of tape reels 2a and 2b. As shown in FIG. A front opening 5 is provided in the lower half 1b, and the bottom plate of the lower half 1b is continuous with this front opening 5. (The pocket formed by the front opening 5 and the bottom opening has a recording/reproducing device.) The tape loading member on the storage side enters and pulls tape 3 from tape cassette A. ) is provided. Lower half 1b along the edge of this bottom opening A front wall is integrally formed on the bottom plate of the case. 1 is divided between the bottom opening side and both tape reels 2a and 2b. and A pair of tape guides 6a and 6b are attached to the bottom surface of the lower half 1b at both left and right ends of the front wall. The tape 3 is integrally formed on the plate, and the tape 3 is connected to both tape guides 6a and 6b. It is guided along the front opening and spanned along the front opening.

[0009] The front opening 5 is covered by a front lid 7 formed in a substantially U-shape. i.e. , this front lid 7 includes a front plate 7a that closes the front of the case body 1, and a front plate 7a that closes the front of the case body 1. Connecting pieces 7b extend rearward from both left and right ends of Made of synthetic resin such as polypropylene, ABS, and PS, which has a protruding rotating shaft 7c. The left and right connecting pieces 7b are recessed portions at the front ends of the left and right side walls of the case body 1. 8a, 8b, and the rotation shaft 7c is provided in the recessed portions 8a, 8b. They are respectively fitted and pivoted. The front cover 7 is mounted around this pivot shaft 7c. The front cover 7 of the base body 1 can be freely rotated between a closed position and an upwardly opened position. For example, a torsion spring 9 (not shown) attached to the right rotation shaft 7c, etc. It is rotatably biased to the normally closed position by an elastic means. In addition, how is the closing biasing mechanism of the front lid 7? Anything is fine.

0010 At the location where the pocket exists, a dust cover is attached to the inside of the front lid 7 through the shaft. The dust cover protects the tape cassette A when it is not in use. Seal the inner side including the lower side of the pocket 3 and the top surface of the opening of the pocket. This prevents dust from entering from the opening surface and adhering to the tape 3. This dust car The bar is on the left and right sides facing the pocket (this side is connected to the tape guides 6a and 6b). When the front cover 7 is opened, dust is removed. The cover also moves upward together with the front lid 7 without interfering with the tape 3 at all. Sunawa In addition, dust is collected from the upper end of the front plate 7a at the left and right ends of the front plate 7a of the front cover 7. A cover mounting piece is integrally installed vertically, and the upper and lower intermediate parts of the dust cover are attached to this mounting piece. The shafts protruding from both left and right ends are pivotably supported. Left and right sides near the bottom edge of the dust cover A pin-shaped cam follower is provided protruding from the cam follower, and the cam follower is inserted into the cam groove. It is interlocked and connected.

[0011] 10 is a locking member made of elastic plastic or metal material; By locking the locking claw of the locking member 10 into the locking part of the front cover 7, the front The lid 7 is configured to be maintained in a locked state. 11 is the top plate portion of the upper half 1a with a wall thickness of 1.4 mm, and 12 is approximately the center of the top plate portion 11. 13 is the top plate part. 11 (thickness of this part is 1.2 mm) Reference numerals 13 are formed on the inner surface of the top plate portion 11 on both sides of the opening portion 12. 14 is the case body An upper hardware partitions the inside of the section 1 between the front opening 5 side and the side where both tape reels 2a and 2b are arranged. The front wall of the half 1a, 15 is the rear wall of the upper half 1a.

0012 Tape cassette A configured as above had a problem on the top plate of the upper half. Warpage can be reduced by reducing the thickness of the top plate part 11 from 1.4 mm to 1.2 mm. Not only was this solved, but the problem of sink marks was also solved. Furthermore, the amount of resin material used It also requires less, and the cost is also low. FIG. 3 is a sectional view of the upper half of the second embodiment of the tape cassette according to the present invention. be.

[0013] In this embodiment, the hollowed out portion 13 is formed not on the inner surface of the top plate portion 11 but on the outer surface. The basic technical idea is the same as that of the first embodiment, so the details are Detailed explanation will be omitted. FIG. 4 is a sectional view of the upper half of the third embodiment of the tape cassette according to the present invention. be.

[0014] In this embodiment, the hollowed out portion 13 is provided only on one side of the inner surface or the outer surface of the top plate portion 11. There is no lightening part 13 on the inner surface side and one lightening part 13 on the outer surface side. Since the basic technical idea is the same as that of the first embodiment, detailed explanation will be given below. Omitted. FIG. 5 is a sectional view of the upper half of the fourth embodiment of the tape cassette according to the present invention. be.

[0015] In this embodiment, the configuration is opposite to that shown in FIG. There are two hollowed out parts 13 on the surface side), and the basic technical idea is that of the third embodiment. Since it is the same as , detailed explanation will be omitted. FIG. 6 is a sectional view of the upper half of the fifth embodiment of the tape cassette according to the present invention. be.

[0016] In this embodiment, the two hollowed out portions 13 in the second embodiment are combined into one. The basic technical idea is the same as that of the second embodiment. Since it is the same as , detailed explanation will be omitted.

[0017]

【effect】

The tape cassette according to the present invention has an upper half and a lower half each having a transparent window. A tape cassette comprising a tape cassette, wherein a hollow part is formed in the top plate part of the upper half. This solves the problem of warping that occurred during the molding stage, and also solves the problem of sink marks. It also has the characteristics of being low-cost and requiring only a small amount of resin. have a long length.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view of a tape cassette.

FIG. 2 is a sectional view of the upper half of the first embodiment of the tape cassette.

FIG. 3 is a sectional view of the upper half of a second embodiment of the tape cassette.

FIG. 4 is a sectional view of the upper half of a third embodiment of the tape cassette.

FIG. 5 is a sectional view of the upper half of a fourth embodiment of the tape cassette.

FIG. 6 is a cross-sectional view of the upper half of a fifth embodiment of the tape cassette.

[Explanation of symbols]

A tape cassette 1 Case body 1a upper half 11 Top plate part 12 Opening 13 Fleshing section

Claims (1)

[Scope of utility model registration request] 1. A tape cassette comprising an upper half and a lower half each having a transparent window, the tape cassette being characterized in that a hollowed out portion is formed in the top plate portion of the upper half.