Abstract: The purpose of the present invention is to allow a clean airflow around a substrate to reliably move downward of the substrate in an examination device in which clean air is supplied to an inspection chamber. This examination device is provided with a rectifying plate (see FIG. 4A) which covers a part of the upper surface of a stage for mounting a substrate, and is disposed between a gas supply unit and the stage to block an airflow toward the substrate.

Abstract: A method of manufacturing a glass substrate for a magnetic disk. The method includes the step of scrub-etching the glass substrate using a pad in the presence of an acid treatment solution. As the acid treatment solution, hydrofluoric acid is used in a range of 0.01 to 1 wt %. The scrub-etching step is performed at temperatures ranging from 5 to 60° C. for 1 second to 300 seconds. The method produces a substrate that is substantially free of asperity.

Abstract: A method of manufacturing a glass substrate for a magnetic disk. The method includes the step of scrub-etching the glass substrate using a pad in the presence of an acid treatment solution. As the acid treatment solution, hydrofluoric acid is used in a range of 0.01 to 1 wt %. The scrub-etching step is performed at temperatures ranging from 5 to 60° C. for 1 second to 300 seconds. The method produces a substrate that is substantially free of asperity.

Abstract: A glass substrate for use as an information recording medium has an average surface roughness (Ra) in the range of 0.3 nm≦Ra<3.0 nm and includes surface irregularities shaped and distributed isotropically and arranged substantially in succession. The surface irregularities include 5 to 50,000 convexities having a height of at least 3 nm and no convexities having a height of at least 15 nm within an area of 50 &mgr;m×50 &mgr;m. A porous region produced by an acid treatment process in the glass substrate would be completely removed if excessively etched by an alkaline solution. However, the etching process using the alkaline solution can be stopped at a stage where the pores in the porous region are enlarged by controlling conditions for the acid and alkali treatment processes.

Abstract: A method of manufacturing a glass substrate for a magnetic disk. The method includes the step of scrub-etching the glass substrate using a pad in the presence of an acid treatment solution. As the acid treatment solution, hydrofluoric acid is used in a range of 0.01 to 1 wt %. The scrub-etching step is performed at temperatures ranging from 5 to 60° C. for 1 second to 300 seconds. The method produces a substrate that is substantially free of asperity.

Abstract: A glass substrate for use as an information recording medium has an average surface roughness (Ra) in the range of 0.3 nm≦Ra<3.0 nm and includes surface irregularities shaped and distributed isotropically and arranged substantially in succession. The surface irregularities include 5 to 50,000 convexities having a height of at least 3 nm and no convexities having a height of at least 15 nm within an area of 50 &mgr;m×50 &mgr;m. A porous region produced by an acid treatment process in the glass substrate would be completely removed if excessively etched by an alkaline solution. However, the etching process using the alkaline solution can be stopped at a stage where the pores in the porous region are enlarged by controlling conditions for the acid and alkali treatment processes.

Abstract: A glass substrate for an information recording medium has an acid resistance represented by an etching rate of at most 45 nm/min. upon contact with a hydrofluoric acid having a temperature of 50° C. and a concentration of 0.1 weight %. The glass substrate has a recording surface having an average surface roughness Ra smaller than 0.3 nm.

Abstract: A glass substrate for an information recording medium has an acid resistance represented by an etching rate of at most 45 nm/min. upon contact with a hydrofluoric acid having a temperature of 50° C. and a concentration of 0.1 weight %. The glass substrate has a recording surface having an average surface roughness Ra smaller than 0.3 nm.

Abstract: A glass substrate for use as an information recording medium has an average surface roughness (Ra) in the range of 0.3 nm≦Ra<3.0 nm and includes surface irregularities shaped and distributed isotropically and arranged substantially in succession. The surface irregularities include 5 to 50,000 convexities having a height of at least 3 nm and no convexities having a height of at least 15 nm within an area of 50 &mgr;m×50 &mgr;m. A porous region produced by an acid treatment process in the glass substrate would be completely removed if excesively etched by an alkaline solution. However, the etching process using the alkaline solution can be stopped at a stage where the pores in the porous region are enlarged by controlling conditions for the acid and alkali treatment processes.

Abstract: A mobile unit database server and a mobile radio router are provided to enable to process data as well as a plurality of communication terminals in one grouping without using telephone lines. The mobile unit database server is used in a communication system having at least one radio server connected to a network, and a radio base station communicating using radio signals with the mobile radio router connected to the radio server and to more than one terminal. The mobile unit database server is provided with: a mobile unit information database storing mobile unit information that associates identifiers and/or FQDNs and/or mobile FQDN of said mobile radio router with the identifiers and/or FQDN and/or IP address of the terminal connected to the mobile radio router, and are stored as mobile unit information; and mobile unit managing devices for renewing mobile unit information in response to a request to register mobile unit information sent from the radio server.

Abstract: A substrate for information recording media is disclosed which has optimized shapes of surface recesses and protrusions and thereby contributes to a reduction in flying height and causes neither head crushing nor thermal asperities. The substrate for information recording media has surface recesses and protrusions wherein the height thereof at a contact proportion for the recesses and protrusions of 0.4% is from 2 to 7 nm when the height of the recesses and protrusions at a contact proportion therefor of 50% is taken as a base. The contact proportion is a value based on the bearing ratio determined with an atomic force microscope.

Abstract: A glass substrate for an information recording medium has an acid resistance represented by an etching rate of at most 45 nm/min. upon contact with a hydrofluoric acid having a temperature of 50° C. and a concentration of 0.1 weight %. The glass substrate has a recording surface having an average surface roughness Ra smaller than 0.3 nm.

Abstract: A mobile station of a two-frequency simplex radio communication system, in which communication between a base station and each mobile station is performed in such a manner that the base station continuously transmits packet data whereas each mobile station transmits burst data. The mobile station includes a radio wave propagation path condition detector for detecting the condition of a radio wave propagation path used for communication, and a communication control circuit which, when it is determined based on the condition of the radio wave propagation path detected by the radio wave propagation path condition detector, that transmission or reception timing cannot be obtained within a predetermined period of time, adaptively selects a transmission mode and notifies the base station of the selected transmission mode so as to receive data which is transmitted from the base station after the notification.

Abstract: A glass substrate for a magnetic disk of the present invention is one in which a laser beam is irradiated on a main surface thereby forming a large number of protrusions thereon to form texture thereon, each of said protrusions being formed by a protruded portion having a convex shape, said glass having a composition in which 0.2 to 3 wt % of an oxide of a transition metal is contained and an absorption coefficient with respect to a wavelength of a light at 266 nm being within a range of 0.03 to 2 .mu.m.sup.-1, and by setting the absorption coefficient of the glass with respect to a wavelength of a light at 266 nm within a range of 0.03 to 2 .mu.m.sup.-1 and irradiating a laser beam having a wavelength in a range of ultraviolet rays selectively on the main surface of a glass substrate at predetermined intervals, texture comprising a large number of protrusions formed by protruded portions each having a small diameter and a convex shape is formed.

Abstract: A cam device comprises a cam, a follower and elastic means for causing the follower to follow the cam. The cam is in the form of a disk and has in a side surface thereof a cam groove having opposite open ends at the outer periphery of the cam. The cam outer periphery has a portion interconnecting opposite ends of a cam groove-defining inner side face which serves as a cam contour face. The follower carries a roller which fits in the cam groove and moves into contact with the cam contour face. The roller can be retained as positioned in contact with or away from the cam contour face.

Abstract: The optical parts according to the invention have a feature of having smoothly coated surfaces for incident and emergent lights covered thereover with a light transmitting solid coating layer, and can be manufactured by a simplified process at least without needing polishing, together with the advantages of being weatherproof in atmosphere of high temperature and high humidity and antiozonant.

Abstract: Disclosed herein is a process for producing a minute-patterned substrate required for optical disk substrates for information recording or the like, which process comprises forming a coating film of a solution containing a metal-organic compound and a thickener on a substrate, pressing a mold against the coating film on the substrate under a reduced pressure and heating the coating film to set up the coating film, then removing the mold, and heating the set coating film on the substrate. By the process it is possible to provide the substrate surface with a minute rough pattern, without generation of surface defects arising from the pressing of the mold against the coating film, and to set up the coating film in a short time and with good dimensional accuracy. It is therefore possible to produce a rough surface pattern with high productivity.

Abstract: A substrate provided thereon, with a film having a large number of fine grooves of a desired pattern is herein disclosed, which comprises a body of substrate and a film of at least one polymerized-condensed or crosslinked organometal compound formed on the substrate and having a large number of fine grooves on the surface and which can be produced by applying a solution containing at least one organometal compound and optionally a thickening agent to the surface of a body of substrate to form a film thereon; then impressing the film with a mold having a large number of fine ridges thereon to form grooves corresponding to the ridges, on the film; or applying the solution to the mold to form such a film and transferring the film to the body of substrate; and then calcining the resulting film having fine grooves to solidify the same. According to the method, an excellent substrate having good durability and optical properties can be produced simply and in a good yield.