Abstract: In order to facilitate positioning of a collimator lens and an optical fiber while preventing cost increase, provided is an optical collimator having a holder (11) which has a cylindrical shape and is made of metal; a collimator lens (12) which is housed in a housing part (11c) formed at an end of the holder (11); and an optical fiber (13) which is inserted via an insertion hole (11a) formed at an opposite end of the holder (11) and is fixed at a predetermined position. At least one of the collimator lens (12) and an end surface of the optical fiber (13) is made to abut to a recess (11e) formed in proximity of the housing part (11c) of the holder (11) thereby to perform positioning.

Abstract: In order to facilitate positioning of a collimator lens and an optical fiber while preventing cost increase, provided is an optical collimator having a holder (11) which has a cylindrical shape and is made of metal; a collimator lens (12) which is housed in a housing part (11c) formed at an end of the holder (11); and an optical fiber (13) which is inserted via an insertion hole (11a) formed at an opposite end of the holder (11) and is fixed at a predetermined position. At least one of the collimator lens (12) and an end surface of the optical fiber (13) is made to abut to a recess (11e) formed in proximity of the housing part (11c) of the holder (11) thereby to perform positioning.

Abstract: A writing implement capable of eliminating troubles associated with the adoption of a grip member having an end surface inclined from a vertical surface perpendicular to a central axis of a shaft tube. The inclination angle ? of a step-facing surface 5A of the grip member 5 is made smaller than the inclination angle ? of an inclined step surface 12 of the shaft tube 10. A gap G is partially formed between the step-facing surface 5A and the inclined step surface 12 when a compressive force is not applied to the grip member 5. When the grip member 5 is compressed, the whole of the step-facing surface 5A is further inclined and comes into contact with the inclined step surface 12.

Abstract: A writing implement capable of eliminating troubles associated with the adoption of a grip member having an end surface inclined from a vertical surface perpendicular to a central axis of a shaft tube. The inclination angle ? of a step-facing surface 5A of the grip member 5 is made smaller than the inclination angle ? of an inclined step surface 12 of the shaft tube 10. A gap G is partially formed between the step-facing surface 5A and the inclined step surface 12 when a compressive force is not applied to the grip member 5. When the grip member 5 is compressed, the whole of the step-facing surface 5A is further inclined and comes into contact with the inclined step surface 12.

Abstract: Provided is a writing instrument comprising an ink tank, an ink holder which can hold an ink, a pen tip, an ink guiding part for guiding the ink in the ink tank to the pen tip and an ink occlusion body which can feed the ink to the ink guiding part and which has an outer skin, wherein through parts are provide in the outer skin of the ink occlusion body.

Abstract: A writing instrument cap having a clip as a separate part. The clip attachment, to which the clip is fitted, is projectively formed on the outer periphery of the cap. The clip attachment is formed with a vent hole penetrating between the interior and exterior of the cap and raised portions for attachment of the clip. The raised portions are provided on both sides of the vent hole, with respect to the circumference of the cap. When the clip is attached to the clip attachment, the clip covers the clip attachment and the vent hole and creates a clearance between the clip interior and the clip attachment so as to establish an air passage that communicates between the vent hole and the outside atmosphere.

Abstract: A writing instrument includes a front barrel and an ink tank. When, with a rear barrel for accommodating the ink tank removably fitted on the ink tank, a cap formed to cover the front barrel is fitted on the front barrel, the cap is positioned and fastened by abutment of the opening end of the cap. The cap has a hollow for accommodating a point assembly. The inside diameter of the hollow exceeds the outside diameter of the front barrel and the outside diameter of a rear end of the rear barrel. A barrel hold is formed along the circumference on the inner wall portion of the cap, so that the barrel hold grips the outer periphery of the rear end of the rear barrel. A guide portion is formed on the inner wall portion of the cap, closer to the front side than the barrel hold, to restrain over insertion of the rear end of the rear barrel into the cap.

Abstract: In a free-ink type collector writing instrument, a collector (5) is formed with a passage hole (10) for providing commutation between the interior and the outside air so as to prevent the point assembly from being affected by the variation in inner pressure upon freezing or upon increase or decrease in pressure. At the same time, the passage hole is constructed in a shape so as not to present a stronger capillary attraction than that of an air/liquid exchanger (9) and than that of an ink feeder portion (3,6), whereby the problem of exudation leakage over time can be prevented.

Abstract: Provided is a writing instrument comprising an ink tank, an ink holder which can hold an ink, a pen tip, an ink guiding part for guiding the ink in the ink tank to the pen tip and an ink occlusion body which can feed the ink to the ink guiding part and which has an outer skin, wherein through parts are provide in the outer skin of the ink occlusion body.

Abstract: A writing instrument is constructed so that a front barrel (5) and an ink tank (4) are formed integrally or as a one-piece structure as a refill (6), and when, with a rear barrel (7) for accommodating the ink tank removably fitted on the ink tank, a cap (3) formed so as to cover the front barrel is fitted on the front barrel, the cap is positioned and fastened by the abutment of the opening end (29b) of the cap. The cap has a hollow (22b) therein for accommodating a point assembly (8) and the inside diameter of the hollow is formed to be greater than the outside diameter of the front barrel and the outside diameter of a rear end (7c) of the rear barrel. A barrel hold (20e) projected inwards is formed along the circumference on the inner wall portion of the cap, so that the barrel hold will grip the outer periphery of the rear end (7c) of the rear barrel.

Abstract: A writing instrument cap (3) has a clip (23) as a separate part and is characterized in that a clip attachment (21e) to which the clip is fitted is projectively formed on the outer periphery of the writing instrument cap, the clip attachment has a vent hole (25) penetrating between the interior and exterior of the writing instrument cap, and in the state where the clip is set to the clip attachment, the clip covers the vent hole and creates a clearance between the clip interior and the clip attachment so as to establish an air passage (24) that communicates between the vent hole and the outside.

Abstract: In a free-ink type collector writing instrument, a collector (5) is formed with a passage hole (10) for providing commutation between the interior and the outside air so as to prevent the point assembly from being affected by the variation in inner pressure upon freezing or upon increase or decrease in pressure. At the same time, the passage hole is constructed in a shape so as not to present a stronger capillary attraction than that of an air/liquid exchanger (9) and than that of an ink feeder portion (3,6), whereby the problem of exudation leakage over time can be prevented.

Abstract: A collector type writing instrument which is formed with a sectioning portion for substantially separating its ink tank and a snorkel having a tubular vent portion for establishing air communication between the front and rear spaces divided by the sectioning portion, wherein at least one ink conduit of a size smaller than that of the vent portion is formed in the sectioning portion. Further, a clearance portion allowing for ink and air bubbles to move therethrough is provided between the collector and snorkel. In addition, the parts present from the sectioning portion to the rear end of the collector are laid out so that ink will be able to spread and wet the surfaces of the parts other than the ink tank. It is also preferable that the end of the tubular vent portion of the snorkel is cut so as to enlarge the opening.

Abstract: In a writing instrument with a collector of the present invention, an ink absorber made up of a fabric sliver etc., capable of keeping ink therein is disposed inside the ink tank and is connected to the center core, longitudinal groove or the like as an ink feeder portion. The ink absorber is adapted to have a length at least reaching to a position more rearwards than the approximate center of the ink tank and has an outside diameter that is sized to be smaller than the inside diameter of the ink tank so as to create a space around itself for permitting free-state ink to move freely while the collector has a lead portion for establishing connection enabling ink to be led from the ink absorber to the air/liquid exchanger. Specifically, the lead portion of the collector may be configured of a projecting portion directly inserted into and connected with the ink absorber and a lead channel formed on the projecting portion.

Abstract: In a free-ink type collector writing instrument, the collector is formed with a partitioning portion for substantially shutting off the ink tank from the outside air, auxiliary retaining grooves are formed on the ink tank side with respect to the air/liquid exchanger of the partitioning portion while main retaining grooves are formed on the front side with respect to the air/liquid exchanger of the partitioning portion, a wide groove formed across the auxiliary retaining grooves for connecting the air/liquid exchanger and the ink tank is formed with a narrow groove extending from the air/liquid exchanger side to the ink tank side and lateral grooves capable of leading ink into the auxiliary retaining grooves. It is further effective if the capacity ‘ie’ of the auxiliary retaining grooves and the capacity ‘is’ of the main retaining grooves are designed so as to satisfy a relation ‘is>ie>0.05·is’ or if effective partitioning portion grooves are formed.

Abstract: A collector type writing instrument including: a collector for temporarily storing ink therein upon a change in inter pressure, a sectioning portion for substantially separating its ink tank for storing ink, and a snorkel having a vent portion for establishing air communication between the front and rear spaces divided by the sectioning portion or an ink absorber for reducing the inner tank volume, wherein the snorkel or the cladding of the ink absorber is molded of the same material as the collector or the ink tank is or is subjected to the same wettability reforming treatment as the collector or the ink tank is.

Abstract: The present invention provides a collector type writing instrument including: a collector for temporarily storing ink therein upon a change in inter pressure, a sectioning portion for substantially separating its ink tank for storing ink, and a snorkel having a vent portion for establishing air communication between the front and rear spaces divided by the sectioning portion or an ink absorber for reducing the inner tank volume, wherein the snorkel or the cladding of the ink absorber is molded of the same material as the collector or the ink tank is or is subjected to the same wettability reforming treatment as the collector or the ink tank is.

Abstract: In a writing instrument with a collector of the present invention, an ink absorber made up of a fabric sliver etc., capable of keeping ink therein is disposed inside the ink tank and is connected to the center core, longitudinal groove or the like as an ink feeder portion. The ink absorber is adapted to have a length at least reaching to a position more rearwards than the approximate center of the ink tank and has an outside diameter that is sized to be smaller than the inside diameter of the ink tank so as to create a space around itself for permitting free-state ink to move freely while the collector has a lead portion for establishing connection enabling ink to be led from the ink absorber to the air/liquid exchanger. Specifically, the lead portion of the collector may be configured of a projecting portion directly inserted into and connected with the ink absorber and a lead channel formed on the projecting portion.

Abstract: The present invention provides a collector type writing instrument which is formed with a sectioning portion for substantially separating its ink tank and a snorkel having a tubular vent portion for establishing air communication between the front and rear spaces divided by the sectioning portion, wherein at least one ink conduit of a size smaller than that of the vent portion is formed in the sectioning portion. Further, a clearance portion allowing for ink and air bubbles to move therethrough is provided between the collector and snorkel. In addition, the parts present from the sectioning portion to the rear end of the collector are laid out so that ink will be able to spread and wet the surfaces of the parts other than the ink tank. It is also preferable that the end of the tubular vent portion of the snorkel is cut so as to enlarge the opening.

Abstract: In a free-ink type collector writing instrument, the collector is formed with a partitioning portion for substantially shutting off the ink tank from the outside air, auxiliary retaining grooves are formed on the ink tank side with respect to the air/liquid exchanger of the partitioning portion while main retaining grooves are formed on the front side with respect to the air/liquid exchanger of the partitioning portion, a wide groove formed across the auxiliary retaining grooves for connecting the air/liquid exchanger and the ink tank is formed with a narrow groove extending from the air/liquid exchanger side to the ink tank side and lateral grooves capable of leading ink into the auxiliary retaining grooves. It is further effective if the capacity ‘ie’ of the auxiliary retaining grooves and the capacity ‘is’ of the main retaining grooves are designed so as to satisfy a relation ‘is>ie>0.05·is’ or if effective partitioning portion grooves are formed.