Display apparatus with coordinate input unit

A display apparatus, comprising:

• a display screen;
• a coordinate input unit having an operating surface, through which information displayed on said display screen can be seen through, provided overlapped on the display screen;
• an adjustable touch pen for performing coordinate input to said operating surface, allowing adjustment of a degree of smoothness of an adjustable pen tip portion on the operating surface among a plurality of levels;
• and
• a controller causing, when the adjustable pen tip portion of said touch pen touches the operating surface of said coordinate input unit, a prescribed object image to be displayed at a position corresponding to said touched position;
• wherein
• said controller includes:
• a display manner selecting unit selecting a manner of displaying said object image on said display screen in accordance with the degree of smoothness of said adjustable pen tip portion of said touch pen, and
• a display controller displaying said object image, when the adjustable pen tip portion of said touch pen touches the operating surface of said coordinate input unit, in a display manner selected by said display manner selecting unit, at a position corresponding to said touched position on said display screen, wherein
• said touch pen further comprises:
• a pen holder,
• a pushing mechanism;
• wherein said adjustable pen tip portion further comprises:
• a rolling tip having a spherical shape, and
• a tip holding member provided at one end of said pen holder, forming a spherical pair with said rolling tip, and receiving and allowing rolling of the rolling tip, and
• said pushing mechanism pushes, from inside of said tip holding member, said rolling tip with switchable pushing force, wherein
• a through hole is formed from one end to the other end in the axial direction in the pen holder;
• and
• said pushing mechanism includes:
• a pushing member fit to the through hole of said pen holder on the side of said one end, and pushing said rolling tip with said tip holding member interposed,
• a sliding member inserted slidably along the axial direction of said pen holder, from the side of said the other end of said pen holder into said through hole of said pen holder,
• a first urging unit inserted between said pushing member and said sliding member, for urging said sliding member to the side of said the other end, and
• a locking unit for holding said sliding member to be locked at any of a plurality of arbitrary positions inside said pen holder, wherein
• said pen holder has an opening reaching said through hole, formed at a portion of an outer circumference;
• a plurality of slots are formed at positions that can face said opening, on an outer circumference of said sliding member;
• and
• said locking unit includes:
• an operation lever having a proximal portion supported on said pen holder, allowing turning about a tangential axial line of the outer circumference of said pen holder, and a distal portion having an engaging piece to be received and engaged with any one of said plurality of slots of said sliding member, and
• a second urging unit provided on said pen holder, urging said operation lever such that said engaging piece is urged toward said sliding member.