US 2007/0177865 A1Published application

Retractable photographic lens

AssigneePENTAX Corporation

InventorsHiroshi NOMURA, Shinya SUZUKA, Ken ENDO

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Abstract

A retractable photographic lens includes a moving ring; a holding frame which holds a retractable optical element and is movable between a photographing position and a displaced position displaced from the photographing position; and a driving device which moves the holding frame from the photographing position to the displaced position using a rearward moving force of the moving ring when the retractable photographic lens moves from a operating state to a fully-retracted state. The driving device includes first and second driving devices which give the holding frame first and second amounts of retractive movement per unit of movement of the moving ring, respectively. When the retractable photographic lens moves from the operating state to the fully-retracted state, the first driving device firstly moves the holding frame toward the displaced position and subsequently the second driving device moves the holding frame to the displaced position.

Claims17

Dependent claims

A retractable photographic lens comprising:

an optical-axis-direction moving ring which moves rearward along an optical axis of a photographing optical system when said retractable photographic lens moves from an operating state to a fully-retracted state;
a retractable-optical-element holding frame which holds a retractable optical element of said photographing optical system, said retractable-optical-element holding frame being positioned inside said optical-axis-direction moving ring and supported thereby to be movable between a photographing position at which said retractable optical element is aligned with said optical axis and a displaced position at which said retractable optical element is displaced from said photographing position;
and
a lens-element-retracting driving device which moves said retractable-optical-element holding frame from said photographing position to said displaced position using a rearward moving force of said optical-axis-direction moving ring when said retractable photographic lens moves from said operating state to said fully-retracted state,
wherein said lens-element-retracting driving device includes a first lens-element-retracting driving device which gives said retractable-optical-element holding frame a first amount of retractive movement per unit of movement of said optical-axis-direction moving ring, and a second lens-element-retracting driving device which gives said retractable-optical-element holding frame a second amount of retractive movement per unit of movement of said optical-axis-direction moving ring, said second amount of retractive movement being smaller than said first amount of retractive movement, and
wherein, when said retractable photographic lens moves from said operating state to said fully-retracted state, said first lens-element-retracting driving device firstly moves said retractable-optical-element holding frame toward said displaced position and subsequently said second lens-element-retracting driving device moves said retractable-optical-element holding frame to said displaced position.

3 more elements

A retractable photographic lens comprising:

an optical-axis-direction moving ring which moves rearward along an optical axis of a photographing optical system when said retractable photographic lens moves from an operating state to a fully-retracted state;
a retractable-optical-element holding frame which holds a retractable optical element of said photographing optical system and is positioned inside said optical-axis-direction moving ring and pivoted about a pivot thereon to be swingable between a photographing position at which said retractable optical element is aligned with said optical axis and a displaced position at which said retractable optical element is displaced from said photographing position;
and
a rotatable lens-element-retracting device which rotates said retractable-optical-element holding frame from said photographing position to said displaced position using a rearward moving force of said optical-axis-direction moving ring when said retractable photographic lens moves from said operating state to said fully-retracted state,
wherein said rotatable lens-element-retracting device includes a first lens-element-retracting rotating device which gives said retractable-optical-element holding frame a first amount of retractive rotation per unit of movement of said optical-axis-direction moving ring in said optical axis direction;
and a second lens-element-retracting rotating device which gives said retractable-optical-element holding frame a second amount of retractive rotation per unit of movement of said optical-axis-direction moving ring in said optical axis direction, said second amount of retractive rotation being smaller than said first amount of retractive rotation,
wherein a radial distance from said first lens-element-retracting rotating device to said pivot of said retractable-optical-element holding frame is different from a radial distance from said second lens-element-retracting rotating device to said pivot of said retractable-optical-element holding frame, and
wherein, when said retractable photographic lens moves from said operating state to said fully-retracted state, said first lens-element-retracting rotating device firstly rotates said retractable-optical-element holding frame toward said displaced position and subsequently said second lens-element-retracting rotating device rotates said retractable-optical-element holding frame to said displaced position.

5 more elements

Dependencies are inferred from the claim text.