Recording medium cartridge and fabrication method thereof

Abstract

A recording medium cartridge and producing method thereof, such that slidability of resin-fabricated members of different materials against one another can be assured even in conditions in which impacts are successively applied. The recording medium cartridge is provided with a recording medium T and a plurality of resin-fabricated components. A mixture C of perfluoropolyethylene and polytetrafluoroethylene is interposed at boundary surfaces at which the resin-fabricated components of different material slide against one another and/or at boundary surfaces at which the resin-fabricated components of different material slide against one another.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

An exemplary embodiment of the present invention will be described in detail based on the following figures, wherein:

FIGS. 1A and 1B are schematic perspective views of a recording tape cartridge;

FIG. 2 is a schematic side sectional view of the recording tape cartridge before a rotation shaft rises;

FIG. 3 is a schematic side sectional view of the recording tape cartridge after the rotation shaft has risen;

FIG. 4 is a schematic exploded perspective view showing a relationship between lock members and a brake member;

FIGS. 5A and 5B are schematic perspective views showing an operation of rotation of the lock members;

FIG. 6 is a schematic plan view showing the operation of rotation of the lock members;

FIG. 7 is a schematic exploded perspective view showing a mounting structure of a lock member to an inner face of a ceiling plate of an upper case;

FIG. 8A is a schematic perspective view of the lock member showing a bottom face side;

FIG. 8B is a side view of the lock member;

FIG. 9 is a schematic side sectional view showing the lock member, which has been mounted to the inner face of the ceiling plate of the upper case; and

FIG. 10 is a graph showing relationships between time and load when brake members engage with lock members.

Claims

1. A recording medium cartridge comprising a recording medium and a plurality of components fabricated of resin, wherein a mixture including perfluoropolyethylene and polytetrafluoroethylene is interposed between boundary surfaces at which, of the plurality of resin-fabricated components, resin-fabricated components of different material slide against one another.

2. The recording medium cartridge of claim 1, wherein the amount by mass of the mixture is from 0.01 mg/cm2 to 0.07 mg/cm2.

3. The recording medium cartridge of claim 1, wherein a recess portion configured to accommodate the mixture is formed at least one of the boundary surfaces.

4. The recording medium cartridge of claim 1, wherein the surface roughness of the boundary surfaces has a maximum height of 5 μm to 50 μm.

5. The recording medium cartridge of claim 1, wherein the coefficient of dynamic friction of the boundary surfaces is 0.1 or less.

6. The recording medium cartridge of claim 1, wherein a combination of the resin-fabricated components that slide against one another includes a component fabricated of a resin selected from materials which include at least one of polycarbonate, acrylonitrile butadiene styrene and polystyrene as a major constituent and a component fabricated of a resin selected from materials which include at least one of polyacetal, polyamide and polyethylene as a major constituent.

7. The recording medium cartridge of claim 1, wherein the resin-fabricated components that slide against one another are urged, respectively, in one direction and an opposite direction.

8. A method of producing a recording medium cartridge which includes a recording medium and a plurality of components fabricated of resin, the method comprising applying a mixture which includes perfluorocarbon, perfluoropolyethylene and polytetrafluoroethylene to at least one of boundary surfaces at which, of the plurality of resin-fabricated components, resin-fabricated components of different material will slide against one another.

9. The method of producing a recording medium cartridge of claim 8, wherein the mixture includes, in percentages by mass, 90%±5% of the perfluorocarbon, 3%±2% of the perfluoropolyethylene and 7%±3% of the polytetrafluoroethylene.

10. The method of producing a recording medium cartridge of claim 8 wherein, after the perfluorocarbon has evaporated from the mixture, the amount by mass of the mixture is from 0.01 mg/cm2 to 0.07 mg/cm2.

11. The method of producing a recording medium cartridge of claim 8, wherein a combination of the resin-fabricated components that slide against one another includes a component fabricated of a resin selected from materials which include at least one of polycarbonate, acrylonitrile butadiene styrene and polystyrene as a major constituent and a component fabricated of a resin selected from materials which include at least one of polyacetal, polyamide and polyethylene as a major constituent.