JP3424365B2 - Tape cassette - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette used for an 8 mm video or the like, and more particularly to a tape cassette in which a tape reel is locked in an inclined state in a cassette housing. The present invention relates to a tape cassette that prevents the tape cassette from being damaged. 2. Description of the Related Art Conventionally, an 8-mm video tape cassette is generally provided with a window made of a transparent member on the upper surface so that a tape reel in the cassette can be recognized. FIG. 3 is an external perspective view of a conventional 8-mm video tape cassette, FIG. 4 is an enlarged cross-sectional view of the tape cassette, and FIG. The cassette housing on the tape reel side is omitted. [0004] The cassette housing generally designated by the reference numeral 1 comprises a lower half 2 and an upper half 3, and two substantially circular window holes 4, 4 are formed on the upper surface of the upper half 3. A window member 5 made of a transparent member such as an acrylic resin is formed by, for example, two-color molding or the like from the entire upper surface of 3. In FIG. 3, reference numeral 6 denotes a cassette housing 1.
It is an opening and closing lid called a lid provided on the front of
In FIG. 4, reference numeral 7 denotes a tape reel housed in the cassette housing 1, which comprises an upper reel 8 and a lower reel 9, and an outer peripheral portion of a reel height positioning projection 10 formed on the bottom surface of the lower reel 9. Is engaged with an opening 11 formed on the bottom surface of the lower half 2. Reference numeral 12 denotes a reel pressing spring that presses against the reel top 13 of the tape reel 7 and holds the tape reel. Reference numerals 14 and 15 fix the lower half 2 and the upper half 3 with screws at the center of the cassette housing 1. Boss for. The tape cassette thus configured is configured so that the tape reel 7 in the cassette housing 1 can be recognized from the window member 5. [0007] By the way, the upper half 3
In the case of a tape cassette in which the window member 5 is molded in two colors, the opening edge of the window hole 4 of the upper half 3 is formed as a vertical step 4a. For this reason, when the window hole 4 is designed to be large, the step portion 4a of the window hole 4 comes closer to the outer peripheral portion of the flange 8a of the upper reel 8. In addition, the flange 8a of the upper reel 8 is located at a position close to the boss 15 for fixing the central portion of the cassette housing 1 with the screw, due to the design of the cassette. However, if the tape cassette is configured as described above, when the cassette is mounted on the reproducing apparatus, when the tape reel is inserted into a reel base (not shown), for example, when the tape reel is pushed up in an inclined state, As shown in FIG. 5, the outer peripheral portion of the upper flange 8a of the tape reel is caught between the step portion 4a of the window hole 4 and the boss 15 on the upper half back surface. When such a problem occurs, the tape reel cannot easily return to the original state, and in the worst case, the tape reel cannot be removed from the playback device when the tape cassette is ejected. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has been made in view of the cassette design change such as a change in the size of the window hole and a change in the outer diameter of the upper reel. It is an object of the present invention to provide a tape cassette that can be prevented from being fitted into the upper half rear surface of a tape reel by a simple method without performing the same. In order to achieve the above object, a tape cassette according to the present invention has a cassette housing composed of an upper half and a lower half, and a window hole formed on the upper surface of the upper half. In a tape cassette in which two tape reels on the supply side and the take-up side are accommodated in a cassette housing and are covered with a window member of a transparent member, the window hole of the upper half is covered with the window member from the upper surface of the upper half. Composed at least
A slope is formed along the opening edge of the window hole corresponding to the boss formed in the center portion of the cassette housing, and the slope is formed.
Is such that it is gently inclined to the side opposite to the window member side. According to the present invention as described above, the opening edge of the window hole is formed on the inclined surface which is gently inclined toward the side opposite to the window side, so that the tape is mounted on the reel base of the reproducing apparatus. When the cassette is inserted, even if the tape reel is pushed up in an inclined state, the outer peripheral portion of the upper flange of the tape reel does not engage because the opening edge of the window hole is the inclined surface,
Therefore, it is possible to avoid in advance the gutter <br/> Migihitsuji problems tape reel is caught in the upper half rear surface. [0013] Further, since the inclined surface is formed at the opening edge of the window hole formed at least on the side surface of the upper half, the outer peripheral portion of the upper flange of the tape reel pushed up in a state where the tape reel is inclined. Is caught between the opening edge of the window and the boss, and the tape reel cannot be returned to the original position. An embodiment of a tape cassette according to the present invention will be described below with reference to the drawings, taking an 8 mm video tape cassette as an example. FIG. 1 is a plan view of the upper half of an 8 mm video tape cassette viewed from the back, and FIG. 2 is an enlarged cross-sectional view of the same, and the cross-sectional view is one tape reel similar to the conventional example shown in FIG. Only the cassette housing on the side is shown, and the cassette housing on the other tape reel side is omitted. In addition, the same components are denoted by the same reference numerals, and redundant description will be omitted. [0016] It is a feature of the present invention, the upper half 3
Step portion 4a having the opening edge shape of the window hole 4 described in the conventional example.
And formed on the inclined surface 16. More specifically, the inclined surface 16 is formed along the opening edge of the substantially circular window hole 4 as shown in FIG. 1, and the inclined surface 16 is formed by a window member as shown in FIG. It is formed so as to be gently inclined at an angle in the range of about 45 ° to the opposite side (outer peripheral side) to the 5th side. The inclined surface 16 may be a flat curved surface, a convex curved surface, a concave curved surface, or the like. According to the present invention having the above structure,
When the tape cassette is inserted into the reel base of the reproducing apparatus, the tape reel 7 is pushed up in an inclined state as shown by a virtual line as shown in FIG. Even if it hits the opening edge, since the opening edge is formed on the inclined surface 16, the outer peripheral portion of the upper flange 8a does not get caught.
Therefore, the upper flange 8a has the boss 15 as shown by an imaginary line.
Since no in structure as sandwiched in radial direction outer peripheral portion of the upper flange 8a even if the strike thrust within,
It is possible to solve the problem that the upper flange 8a is fitted on the back surface of the upper half and does not return to the original state as in the related art. Although the case where the inclined surface 16 is formed along the entire periphery of the opening edge of the window hole 4 has been described, the inclined surface 16 actually corresponds to the boss 15 with the window member 5 interposed therebetween. It is sufficient that the opening is formed at the opening edge of the window hole 4, that is, at least at the opening edge of the window hole 4 on the side surface of the upper half 3. The present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention. The tape cassette according to the present invention has been described with reference to the case of the circular window hole 4 in the embodiment. However, the tape hole may be of a rectangular shape crossing the width direction of the tape cassette. In this case, an inclined surface may be formed at the opening edges on both sides in the width direction of the window hole. In the embodiment, the case of the tape cassette for 8 mm video has been described as an example.
The present invention can be widely applied to an opening edge portion of a window hole of a video tape cassette of a beta type or a video tape cassette of a beta type. As described above, according to the present invention, the size of the window hole can be changed or increased by forming the opening edge of the window hole on an inclined surface that is gently inclined toward the side opposite to the window side. There is an effect that the tape reel can be prevented from being fitted into the upper half back surface by a simple method without changing the design of the cassette, such as changing the outer diameter of the reel. Further, the inclined surface is formed at the opening edge of the window hole formed at least on the side surface of the upper half, so that the tape reel can be changed only by changing a part of the opening edge of the window hole. The engagement with the back surface of the upper half can be eliminated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of an upper half of a tape cassette of the present example as viewed from a back surface. FIG. 2 is an enlarged sectional view of a part of the tape cassette of the present embodiment. FIG. 3 is a perspective view of a conventional 8-mm video tape cassette. FIG. 4 is an enlarged sectional view of a part of a conventional tape cassette. FIG. 5 is an explanatory diagram of a problem of a conventional tape cassette. [Description of Signs] 1 Cassette housing 2 Lower half 3 Upper half 4 Window hole 5 Window member 7 Tape reel 8 Upper reel 8a Flange 9 Lower reel 15 Boss 16 Inclined surface

Claims (1)

(57) [Claims 1] The cassette housing comprises an upper half and a lower half, and a window hole formed on the upper surface of the upper half is covered with a transparent member. in a tape cassette in which two tape reels of the supply side and the take-up side in the body is housed, the window holes of the upper half is configured to cover above the window member from the upper surface of the upper half, at least the cassette housing
An inclined surface is formed along the opening edge of the window hole corresponding to the boss formed at the center portion of the
Serial tape cassette, characterized in that the inclined loosely to the side opposite to the window member.