Abstract: A magnetic tape cartridge includes a cartridge casing formed by upper and lower casing halves and a single reel around which a magnetic tape with a leader pin fixed to its leading end is wound and which is contained in the cartridge casing for rotation. A spring member removably holds upper and lower end portions of the leader pin on the cartridge casing. The spring member includes upper and lower holding portions which are respectively brought into abutment against the upper and lower end portions of the leader pin and are connected to each other.

Abstract: A magnetic tape cartridge includes a cartridge casing formed by upper and lower casing halves and a single reel around which a magnetic tape is wound and which is contained in the cartridge casing for rotation. A slide door for opening and closing a tape outlet opening is mounted on the cartridge casing to be linearly slidable along a door passage between a closing position where it closes the tape outlet opening and an opening position where it opens the tape outlet opening. A door spring for urging the slide door toward the closing position and holding the same in the closing position is disposed on the door passage.

Abstract: A magnetic tape cartridge has a cartridge casing, a single reel around which a magnetic tape is wound and which is contained in the cartridge casing for rotation and a leader pin fixed to the leading end portion of the magnetic tape. The leader pin is provided at its opposite ends with engagement portions which are brought into engagement with a tape drawing mechanism of a recording and reproducing system when the magnetic tape cartridge is loaded in the recording and reproducing system. The end face of each engagement portion is provided with a recess at which the tape drawing mechanism chucks the leader pin.

Abstract: A magnetic tape cartridge includes a cartridge casing formed by upper and lower casing halves and a single reel around which a magnetic tape with a leader pin fixed to its leading end is wound and which is contained in the cartridge casing for rotation. A spring member removably holds upper and lower end portions of the leader pin on the cartridge casing. The spring member includes upper and lower holding portions which are respectively brought into abutment against the upper and lower end portions of the leader pin and are connected to each other.

Abstract: Disclosed herein is a magnetic tape cartridge including a reel-rotation restraining member which restricts rotation of a reel when not used and allows the rotation of the reel when used. The reel-rotation restraining member has a restraining member, an urging member, and an unlocking member. The restraining member has a restraining gear which meshes with a locking tooth portion, and the restraining member is supported by a support portion of the cartridge case.

Abstract: Disclosed herein is a magnetic tape cartridge including a cartridge case. In the cartridge case, a single reel with magnetic tape wound thereon is rotatably housed, and a leader pin coupled with a leading end of the magnetic tape is caught by a pin catching member of a recording-reproducing unit and is inserted into a tape leader opening formed in the cartridge case. The magnetic tape cartridge also includes a pin retaining spring member which elastically engages the leader pin so that the leader pin is detachably retained at a predetermined position within the cartridge case. Furthermore, a wall surface is provided in the cartridge case so that when the leader pin is inserted into the cartridge case, displacement of the pin retaining member due to the engagement of the pin retaining member with the leader pin is regulated within a predetermined range.

Abstract: A single-reel magnetic tape cartridge has a cartridge casing and a single reel around which a magnetic tape is wound and which is contained in the cartridge casing for rotation, in which the magnetic tape is fixed at the leading edge thereof to a leader pin employed for extracting the magnetic tape from the cartridge and the flanges at the upper and lower ends of the leader pin are engaged by the lateral drawing force of a latch spring removably held in the tape cartridge casing. Even for cases in which there is a deviation in the insertion position in which leader pin is inserted by the record and playback apparatus, etc. causing the entry path of the leader pin into the cartridge casing to be off track, etc., it is still possible for the leader pin to be inserted into the cartridge casing.

Abstract: A magnetic tape cartridge has a cartridge casing, a single reel around which a magnetic tape is wound and which is contained in the cartridge casing for rotation and a leader pin fixed to the leading end portion of the magnetic tape. The leader pin is provided at its opposite ends with engagement portions which are brought into engagement with a tape drawing mechanism of a recording and reproducing system when the magnetic tape cartridge is loaded in the recording and reproducing system. The end face of each engagement portion is provided with a recess at which the tape drawing mechanism chucks the leader pin.

Abstract: A magnetic tape cartridge includes a cartridge casing formed by upper and lower casing halves and a single reel around which a magnetic tape with a leader pin fixed to its leading end is wound and which is contained in the cartridge casing for rotation. A spring member removably holds upper and lower end portions of the leader pin on the cartridge casing. The spring member includes upper and lower holding portions which are respectively brought into abutment against the upper and lower end portions of the leader pin and are connected to each other.

Abstract: A magnetic tape cartridge includes a cartridge casing formed by upper and lower casing halves and a single reel around which a magnetic tape is wound and which is contained in the cartridge casing for rotation. A slide door for opening and closing a tape outlet opening is mounted on the cartridge casing to be linearly slidable along a door passage between a closing position where it closes the tape outlet opening and an opening position where it opens the tape outlet opening. A door spring for urging the slide door toward the closing position and holding the same in the closing position is disposed on the door passage.

Abstract: A magnetic tape cartridge includes a cartridge casing formed by upper and lower casing halves and a single reel around which a magnetic tape with a leader pin fixed to its leading end is wound and which is contained in the cartridge casing for rotation. A spring member removably holds upper and lower end portions of the leader pin on the cartridge casing. The spring member includes upper and lower holding portions which are respectively brought into abutment against the upper and lower end portions of the leader pin and are connected to each other.

Abstract: A magnetic tape cartridge includes a cartridge casing formed by upper and lower casing halves and a single reel around which a magnetic tape with a leader pin fixed to its leading end is wound and which is contained in the cartridge casing for rotation. A spring member removably holds upper and lower end portions of the leader pin on the cartridge casing. The spring member includes upper and lower holding portions which are respectively brought into abutment against the upper and lower end portions of the leader pin and are connected to each other.

Abstract: Disclosed is an information storage medium having an air-sandwich structure which comprises two disc-shaped substrates joined together through a ring-shaped inner spacer and a ring-shaped outer spacer. These spacers are made of the same kind of resin as those forming the disc substrates and the resin of the spacers has a viscosity-average molecular weight larger than that of the resin of the substrates. Also disclosed is a process for producing the information storage medium by joining the spacers to the disc substrates by means of ultrasonic welding.

Abstract: An improved injection molding process for producing a substrate of an optical disc having a high quality is disclosed. The process includes the steps of: fixing a stamper having protrusions corresponding to pits for recorded information or a groove for tracking onto one mold unit of a pair of mold units of an injection molding machine; combining the mold units to form a closed cavity between the pair of mold units; charging a molten molding resin into the cavity; cooling the resin in the cavity to form a molded substrate; separating one mold unit from another mold unit; and releasing the molded substrate simultaneously from both mold units when the two mold units are separated from each other by applying pressurized air onto both sides of the substrate.