TECHNICAL FIELD

The present invention relates to an interchangeable lens and a camera body.

BACKGROUND ART

Conventionally, an interchangeable lens capable of calculating aperture drive time has been known with a camera system of a so-called single-lens reflex type. For example, Patent Literature 1 describes a configuration in which a lens microcomputer in an interchangeable lens calculates the aperture drive time based on aperture speed information stored in an internal memory in advance and driving amount information received from a camera microcomputer.

CITATION LIST

Patent Literature

PATENT LITERATURE 1: Japanese Laid Open Patent Publication No. 2006-208897

SUMMARY OF INVENTION

Technical Problem

The conventional technology has a problem of the inability to properly control driving of a driven member when information which is stored in a storage medium inside the interchangeable lens in advance is damaged due to, for example, strong electric impacts.

Solution to Problem

An interchangeable lens according to a first aspect of the present invention comprises: a mount unit on which a camera body can be mounted; a driven member; a drive unit that drives the driven member; a storage unit that stores lens data related to driving of the driven member by the drive unit; and a transmitter that sends lens-side judgment data, based on which whether the lens data is properly stored in the storage unit can be judged at the camera body, to the camera body.

According to a second aspect of the present invention, in the interchangeable lens according to the first aspect, it is preferable that the lens-side judgment data is generated based on the lens data stored in the storage unit.

According to a third aspect of the present invention, in the interchangeable lens according to the first or second aspect, it is preferable to further comprise: an estimation unit that estimates drive time required for the drive unit to drive the driven member by a desired driving amount at a desired drive speed based on the lens data stored in the storage unit.

According to a fourth aspect of the present invention, in the interchangeable lens according to the third aspect, it is preferable that the transmitter sends the drive time estimated by the estimation unit as the lens-side judgment data to the camera body. According to a fifth aspect of the present invention, in the interchangeable lens according to the fourth aspect, it is preferable that the lens data includes an operation expression to calculate the drive time by using at least the desired drive speed and the desired driving amount; and the estimation unit estimates the drive time by calculation processing that uses the operation expression.

According to a sixth aspect of the present invention, in the interchangeable lens according to the fifth aspect, it is preferable that the lens data includes a simple operation expression to calculate the drive time by using only the desired drive speed and the desired driving amount; and the estimation unit estimates the drive time by calculation processing that uses the simple operation expression.

According to a seventh aspect of the present invention, in the interchangeable lens according to the fifth or sixth aspect, it is preferable that the estimation unit calculates the drive time by changing at least one of values of the drive speed and the driving amount every time the calculation is performed.

According to an eighth aspect of the present invention, in the interchangeable lens according to the fifth aspect, it is preferable that the storage unit stores the lens data including at least one of the operation expression of the drive time and correction term data given to the operation expression of the drive time; and the transmitter sends at least part of the correction term data as data related to the lens-side judgment data to the camera body.

According to a ninth aspect of the present invention, in the interchangeable lens according to the fifth or sixth aspect, it is preferable that the estimation unit calculates a plurality of drive times by executing the calculation processing to calculate the drive time every time the estimation unit receives a combination of the desired drive speed and the desired driving amount; and the transmitter sends information about the plurality of drive times calculated by the calculation processing as the lens-side judgment data to the camera body.

According to a tenth aspect of the present invention, in the interchangeable lens according to the third aspect, it is preferable that the transmitter sends at least part of the lens data stored in the storage unit as the lens-side judgment data to the camera body.

According to an eleventh aspect of the present invention, in the interchangeable lens according to the tenth aspect, it is preferable that the storage unit stores the lens data including at least one of an operation expression of the drive time and a parameter given to the operation expression of the drive time.

According to a twelfth aspect of the present invention, in the interchangeable lens according to any one of the first to eleventh aspects, it is preferable to further comprise: an optical system including the driven member, wherein: the driven member includes any one of a member capable of moving along an optical axis of the optical system, a member capable of moving in a direction including a component perpendicular to the optical axis, and a member capable of moving so as to change a size of an opening through which a light flux passes.

A camera body according to a thirteenth aspect of the present invention comprise: mount unit on which an interchangeable lens including a driven member and a storage medium storing lens data related to driving of the driven member can be mounted; a receiver that receives lens-side judgment data, based on which whether the lens data is properly stored in the storage medium or not can be judged, from the interchangeable lens; and a judgment unit that judges whether the lens data is properly stored in the storage medium or not, based on the lens-side judgment data received from the receiver.

According to a fourteenth aspect of the present invention, in the camera body according to the thirteenth aspect, it is preferable that the receiver receives the lens-side judgment data generated based on the lens data stored in the storage medium.

According to a fifteenth aspect of the present invention, in the camera body according to the thirteenth or fourteenth aspect, it is preferable that the receiver receives drive time, which is required to drive the driven member by a desired driving amount at a desired drive speed and is estimated by the interchangeable lens based on the lens data, as the lens-side judgment data from the interchangeable lens.

According to a sixteenth aspect of the present invention, in the camera body according to the fifteenth aspect, it is preferable to further comprise: a storage unit that stores body-side data to be compared with the lens-side judgment data received from the receiver, wherein: the judgment unit performs the judgment based on the body-side data and the lens-side judgment data received from the receiver.

According to a seventeenth aspect of the present invention, in the camera body according to the sixteenth aspect, it is preferable that the body-side data comprises data associating information about drive time required to drive the driven member by a desired driving amount at a desired drive speed with the desired drive speed and the desired driving amount.

According to an eighteenth aspect of the present invention, in the camera body according to the seventeenth aspect, it is preferable that the storage unit stores a plurality of pieces of the body-side data which are mutually different; and the judgment unit selects one of the plurality of pieces of the body-side data stored in the storage unit and performs the judgment by comparing the information about the drive time included in the selected body-side data with the received lens-side judgment data.

According to a nineteenth aspect of the present invention, in the camera body according to the fifteenth aspect, it is preferable to further comprise: a storage unit that stores body-side data which is partially identical to the lens data stored in the storage medium; and an estimation unit that estimates drive time required to drive the driven member by the desired driving amount at the desired drive speed based on the body-side data stored in the storage unit, wherein: the judgment unit judges whether the lens data is properly stored in the storage medium or not, by comparing the drive time estimated by the estimation unit with the lens-side judgment data received from the receiver.

According to a twentieth aspect of the present invention, in the camera body according to the nineteenth aspect, it is preferable that the storage unit stores the lens data including an operation expression of the drive time.

According to a twenty-first aspect of the present invention, in the camera body according to the fifteenth aspect, it is preferable that the storage unit stores an operation expression same as an operation expression stored in the storage medium to calculate the drive time; the receiver receives at least part of correction term data, which is stored in the storage medium and given to the operation expression to calculate the drive time, from the storage medium; the estimation unit calculates the drive time based on the correction term data received from the receiver and the operation expression; and the judgment unit performs the judgment based on the drive time calculated by the estimation unit and the lens-side judgment data received by the receiver.

According to a twenty-second aspect of the present invention, in the camera body according to the fifteenth aspect, it is preferable that the receiver receives a plurality of drive times as the lens-side judgment data, each of the plurality of drive times corresponding to the drive time; and the judgment unit performs the judgment based on a size relation between the plurality of drive times received by the receiver.

According to a twenty-third aspect of the present invention, in the camera body according to the thirteenth or fourteenth aspect, it is preferable that the receiver receives at least part of the lens data stored in the storage medium as the lens-side judgment data from the interchangeable lens.

Advantageous Effect of the Invention

Driving of the driven member can be controlled with excellent precision and certainty according to the present invention.

