JPH01150291A - Tape cassette - Google Patents

Abstract

PURPOSE:To improve traveling stability by destaticizing an opposite face adjacent to a tape. CONSTITUTION:A tape cassette is formed by an upper half 29 and a lower half 30. A fan 31 is arranged on the front side of the cassette and air 32 ionized by the impression of AC voltage is carried like an arrow. Thereby, the surface potential of the front side of a cassette body opposed to the tape and a tape traveling area is ionized and remarkably reduced by the destaticizing effect of the air 32. Since at least the tape traveling face is previously destaticized prior to the loading of the magnetic tape, the surface potential is not sharply increased at the time of traveling the tape, the sticking of the tape, the adhesion of dust, etc., can be suppressed and the traveling stability can be improved.

Description

[Detailed description of the invention] B. Industrial application field The present invention relates to tape cassettes.

In a prior art tape cassette, for example, a tape cassette for a video tape recorder, as shown in FIGS. 4 and 5, a pair of left and right lower flanges 25.
It has a structure in which a lower half 30 containing reel hubs 12 and 13 (tape reels) with 26 attached thereto and an upper half 29 to which a leaf spring 11 that presses and holds each reel hub is fixed are joined. In the reel hub pressing area by the leaf spring 11, a transparent reel flange 17
Small protrusions 22 and 23, called pivots, are fitted into the centers of and 18, and the leaf springs 11 are engaged with these pivots. In addition, in the figure, 14 and 15 are a pair of left and right transparent windows.

In addition, there are protrusions 27 and 28 on the front side of the tape cassette body.
is provided, and a tape facing surface is provided on the front surface of the protrusion 27, 28 in close proximity to the tape 6.

Such tape cassettes have the following problems.

That is, during fast forwarding, rewinding, etc., the magnetic tape 6 runs at high speed in close proximity to the tape facing surface, so that charging occurs due to contact between the tape and the tape facing surface in the running area of the tape facing surface. As a result, the tape 6 sticks to the tape facing surface in the tape running area, reducing the running properties of the tape and making the winding appearance poor. Furthermore, dust is attracted to the tape 6 due to the charging, which causes dropouts on the image.

Therefore, it has been desired to prevent the tape running surface from being charged.

The purpose of the present invention is to prevent the tape running surface from being electrostatically charged to prevent the tape from sticking, to maintain stable tape running, to provide a good tape winding appearance, to prevent dust from being attracted, and to prevent the tape from adhering to the tape. An object of the present invention is to provide a tape cassette that can suppress dropouts.

20 Structure of the Invention The present invention has a tape facing surface close to the magnetic tape on the front side of the main body, and at least this facing surface is subjected to static elimination processing by means existing separately from the main body, or a process including this static elimination processing. This relates to a tape cassette whose static electricity has been removed by

E, Example The present invention will be explained in detail below.

FIG. 1 shows the tape cassette ionized on the front surface. FIG. 1 shows the upper half and lower half of the tape cassette molded and assembled together, and the magnetic tape 6 (shown by imaginary lines in FIG. 2). has not yet been attached to the reel hub 12.13.

A fan 31 is installed on the front side of the tape cassette, and air 32 (which can contain positive ions and negative ions) that is ionized under an AC voltage flows through the fan 31 as shown by the arrow.
The tape is fed to the front side of the tape cassette.

As a result, the tape facing surface 2 on the entire surface side of the tape cassette body
, the surface potential of the tape running region 2a is significantly reduced due to the static elimination effect of the ionized air 32.

That is, in the conventional tape cassette, after the upper half 29 and lower half 30 of the cassette were formed, the absolute value of the surface potential had already increased to around 500 V.

Therefore, in the past, problems such as sticking of the tape, adhesion of lumps, and unstable running of the tape became noticeable during running of the tape.

In contrast, as shown in FIG. 1, when ionized air is fed into the tape cassette, the upper half 29 of the main body
Both of the lower halves 30 are effectively neutralized (for example, the surface potential is about ±soo v).In this way, by eliminating static electricity from at least the tape running surface 2 before installing the magnetic tape, the tape can be mounted and run later. Even when the surface voltage is increased, the surface potential does not increase significantly, and it can have a remarkable effect on preventing tape from sticking, preventing clumps from adhering, and improving running stability.

Even when the upper half 29 and the lower half 30 are molded, a large amount of electrical charge is already generated in the upper half 29 and the lower half 30. Therefore, if ionized air 32 is blown onto the upper half 29 and the lower half 30 immediately after they are fitted together, a remarkable static neutralizing effect can be obtained and the surface potential can be significantly reduced.

In addition, in FIG. 2, wall portions 5 are provided at the upper and lower ends of the projections 27 and 28, respectively, in parallel to the running direction of the tape 6, and on the tape running surface 2, linear projections (
A plurality of ribs 3A and 3B are provided. According to this, even when the tape is fast forwarded or rewinded, the tape 6
does not come into surface contact with the tape opposing surface 2 in the tape running region 2a, but only makes line contact with the plurality of ribs 3A, 3B, which is further advantageous in reducing frictional force and charging.

In the tape cassette shown in FIGS. 1 and 2, the ribs 3 form an upper half 29 and a lower half 30 that constitute the main body.
Since it is provided on both sides, it is considered to be more preferable in terms of running performance. Furthermore, since a gap 4 is provided between the rib 3A provided on the upper half 29 of the main body and the rib 3B provided on the lower half 30, the tape 6 and The contact area with the ribs is further reduced, which is advantageous.

Furthermore, it is also a preferable condition that the ribs 3A and 3 are not present at the left and right ends of the projections 27 and 28 (see FIG. 2). When the ribs are arranged in this manner, the ends of the protrusions 27 and 28 facing the tape are low at the ends and high on the inside, and this state acts as a large protrusion. Therefore, compared to the case where ribs are present at each of the left and right ends, friction with the back surface of the tape is less likely to occur, which is advantageous.

FIG. 3 is a schematic plan view showing another embodiment.

In this example, there is a static elimination bar -3 on the front side of the tape cassette.
3 is installed to eliminate static electricity on the surface of the main unit.

This method also provides the same effects as the example shown in FIG.

The tape cassette body is made of polystyrene, AS resin, AB
Various resins can be used, such as S resin, polyolefin, polyacetal, polycarbonate, polyamide, and reinforced acrylic resin, but are not limited to these.

High impact polystyrene, high impact ABS resin, heat resistance A
BS resin can also be used. However, other resins and various fillers may be blended into the resin.

An antistatic agent may be included in the resin used to mold the upper and lower halves of the main body. The content of the antistatic agent is preferably within the range of 0.1% to 0.8% by weight of the resin, and preferably within the range of 0.2% to 0.5% by weight (for example, 0.5% by weight).
4% by weight) is more preferable. If the content of the antistatic agent is less than the above range, the antistatic effect will not be significant, and if it is more than the above range, the strength of the resin will tend to decrease.

Examples of the antistatic agent include various surfactants and inorganic fillers.

The surfactants used include carboxylic acid compounds (e.g. adipic acid, glutaric acid, styrene-maleic acid copolymer potassium salt), guanidine derivatives (ferroguanidine derivatives, etc.), phosphate-containing anion surfactants (e.g. alkyl These include phosphoric acid esters, polyacetals, alkyl phosphoric acid ester metal salts, etc. Examples include di-β-(β-ethoxy)-dioxane dialkyl phosphoric acid ester metal salts, pentaalkyl triphosphates, hexaalkyl tetrabolyphosphates. etc.), sulfonic acids (e.g. orgostyrene sulfonic acid, alkylaryl sulfonic acid,
Anionic surfactants such as triethanolamine salts of polystyrene sulfonic acid), quaternary ammonium salts, pyridinium salts, imidacillin derivatives, morpholine derivatives, polyethylene glycol nonionic surfactants such as polyoxyethylene-alkylphenols and alkylamidoethers, These include sorbitan fatty acid esters.

Polymers such as acrylic acid and methacrylic acid (formula below) having functional groups also provide antistatic properties. In addition, fatty acid amides and fatty acid amines are surface active (R: H* CH3
; Rt+ R21R3: alkyl group; X: acid group) It can also be used in combination with an agent. In particular, ammonium salt type,
Compounds containing phosphoric acid residues are preferred. Inorganic fillers include copper chloride, calcium fluoride, various metal salts, Ca
Examples include oxides such as SM g % Z n % T is Fe, kaolin, sodium aminosilicate, calcium silicate, and the like.

It is also possible to apply an antistatic agent to the tape facing surface, and the tape running surface can be made rough to reduce frictional force.

Next, a more specific example will be described.

Manufacture of tape cassette> 1 Difference 10- The upper half and lower half are molded with PS resin, and as shown in Figure 1, static electricity removal treatment is performed using ionized air, and as shown in Figures 1 and 2. A VH3 type tape cassette of Example 1 was manufactured.

A VH3 type tape cassette was manufactured in the same manner as in Example 1, except that static electricity was eliminated using the static elimination bar shown in FIG.

An upper half and a lower half of a comparative plate were molded in the same manner as in Example 1. However, the 3rd day of Rip 3A shown in Figure 2 was not provided. Then, a VH3 type tape force set was manufactured in the same manner as in Example 1 except that the static elimination treatment was not performed.

Measurements Using each of the tape cassettes described above, the adhesion of the tape during running, presence or absence of tape stops, and dropout characteristics on images were measured.

The results are as follows.

Adhesion of tape: Example 1: None Example 2: None Comparative example: Yes Tape stop during tape running: Example 1: None Example 2: None Comparative example: Yes Drop out: Example 1: Not many occurrences.

Example 2: Not many occurrences.

Comparative example: Frequent occurrence.

Although the embodiments of the present invention have been illustrated above, the embodiments of the present invention are not limited to those described above, and various modifications can be made based on the technical idea of the present invention.

In FIGS. 1 and 3, the installation position, number, size, shape, structure, etc. of the fan 31 and the static elimination bar 33 may be varied, and the fan 31 and the static elimination bar 33 may be used together. In addition, there is no need to remove static electricity from the entire surface of the tape cassette as described above.
It is also possible to neutralize only the front side of the main body or only the tape running surface. Further, the static eliminating means that exists separately from the main body is not limited to ionized air or a static eliminating bar.

There is no particular restriction on the timing of the static elimination process using a static elimination bar, ionized air, etc. as long as it is performed after the upper half and lower half have been molded. Both may be joined later.

In Figure 2, the shape, dimensions, number of ribs 3A, 3rd,
The position etc. can be changed in various ways.

Effects of the Invention According to the tape cassette of the present invention, the tape cassette has a tape facing surface close to the magnetic tape on the front side of the main body, and at least this facing surface is subjected to static elimination treatment by means existing separately from the main body, or this Since static electricity is removed through a process that includes static elimination treatment, at least the amount of charge on the tape facing surface is significantly reduced, friction and rubbing with the magnetic tape are reduced, and the surface potential of the tape facing surface is kept low even when the tape is running. Can be done. Therefore, even when the tape is running, it is possible to prevent the magnetic tape from sticking to the tape facing surface, dust from adhering to the magnetic tape, and dropouts caused by this.
Tape running properties are improved.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention. FIG. 1 is a schematic plan view showing a state in which a tape cassette is subjected to static elimination treatment with ionized air, and FIG. FIG. 3 is a schematic plan view showing a state in which the tape cassette is subjected to static elimination processing using a static elimination bar. 4 is a plan view showing the tape cassette, and FIG. 5 is a sectional view taken along the line V-V in FIG. 4. In addition, in the symbols shown in the drawings, 2...Tape opposing surface 2a...Tape running areas 3A, 3B...
......Rib 4...Gap 6...Magnetic tape 27.28...Protrusion 29... ...Body upper half 30 ...Body lower half 31 ...Fan 32 ...Ionized air 33 ...
...It is a static elimination bar.

Claims (1)

[Claims] 1. A tape cassette that has a tape facing surface close to the magnetic tape on the front side of the main body, and at least this facing surface is static-neutralized by means provided separately from the main body, or by a process that includes this static-eliminating process. .