The present invention provides an improved structure of handheld direct digital image sensor, which comprises a connecting support rod provided with a holding portion, an engaging portion and a carrying portion, and the surface of the carrying portion is configured with at least one male connecting member. The male connecting member is assembled with a direct digital image sensor, and the outer surface of the direct digital image sensor is provided with more than one female connecting member corresponding to the male connecting member. The present invention utilizes the engagement of connecting members to directly assemble the direct digital image sensor at the end of the connecting support rod, so as to enhance the assembly stability and prevent the displacement easily caused by contacting the patients teeth. Besides, the assembly width of the connecting support rod and the direct digital image sensor may be reduced by means of engagement, so as to reduce the patients discomfort when in use.一種手持直接數位顯像感應裝置改良結構,包含一接合承柄,設有握持部、咬合部及承載部且於承載部表面設有至少一公接合組件,上述公接合組件上組接有一直接數位顯像感應器,並於直接數位顯像感應器外表面設有一個以上與公接合組件對應的母接合組件。本發明利用接合組件嵌合的方式,讓直接數位顯像感應器直接組接於接合承柄末端,提升組接的穩固性,避免容易因為觸碰到病患牙齒而移位,且嵌合的方式能減少接合承柄與直接數位顯像感應器組裝的寬度,以減少病患在使用時的不舒適感。20‧‧‧接合承柄21‧‧‧握持部22‧‧‧咬合部23‧‧‧承載部24‧‧‧公接合組件241‧‧‧嵌合凸塊25‧‧‧定位凸塊26‧‧‧握持柄261‧‧‧轉向插接結構262‧‧‧卡扣塊27‧‧‧基座271‧‧‧定向接頭272‧‧‧卡扣槽273‧‧‧第一抵靠件274‧‧‧第二抵靠件275‧‧‧止滑溝紋276‧‧‧擋片30‧‧‧直接數位顯像感應器31‧‧‧母接合組件311‧‧‧嵌合凹槽40‧‧‧定位架41‧‧‧定位桿42‧‧‧定位環
