Abstract: A foldable chair frame with armrests, having two frames; each frame contains a backrest rod, an oblique supporting rod, a seat rod and an armrest supporting rod; upper end of the oblique supporting rod is pivotal to the backrest rod; lower end of the armrest supporting rod is slidably connected to the oblique supporting rod; the seat rod is pivotal to both the backrest rod and the oblique supporting rod; an armrest rod is given between the backrest rod and the armrest supporting rod; the armrest rod has a front end pivotal to an upper end of the armrest supporting rod and a rear end connected with a supporting piece which is pivotal to the backrest rod and positioned below a rear connecting seat; a sliding groove is opened at the bottom of the armrest rod allowing a position limiting portion of the supporting piece to be limited there and slidable therein when the armrest rod is folded or unfolded.

Abstract: A folding chair frame structure includes left and right supporting frame units, front and rear connecting frame units, and a pair of armrest supporting rods. A top of each armrest supporting rod has a spherical head. Each armrest supporting rod has an engaging groove below the spherical head. A pair of armrest rods is pivotally connected to respective rear parts of the left and right supporting frame units. A front end of each armrest rod has a joint. A lower end of the joint has an accommodating chamber. A side wall of the accommodating chamber has at least one receiving opening. An engaging plate is detachably inserted in the receiving opening. The engaging plate has a through hole. When the spherical head is inserted in the accommodating chamber and passes through the through hole, the engaging plate is engaged with the engaging groove.

Abstract: A foldable chair frame with armrests, having two frames; each frame contains a backrest rod, an oblique supporting rod, a seat rod and an armrest supporting rod; upper end of the oblique supporting rod is pivotal to the backrest rod; lower end of the armrest supporting rod is slidably connected to the oblique supporting rod; the seat rod is pivotal to both the backrest rod and the oblique supporting rod; an armrest rod is given between the backrest rod and the armrest supporting rod; the armrest rod has a front end pivotal to an upper end of the armrest supporting rod and a rear end connected with a supporting piece which is pivotal to the backrest rod and positioned below a rear connecting seat; a sliding groove is opened at the bottom of the armrest rod allowing a position limiting portion of the supporting piece to be limited there and slidable therein when the armrest rod is folded or unfolded.

Abstract: A folding chair frame structure includes left and right supporting frame units, front and rear connecting frame units, and a pair of armrest supporting rods. A top of each armrest supporting rod has a spherical head. Each armrest supporting rod has an engaging groove below the spherical head. A pair of armrest rods is pivotally connected to respective rear parts of the left and right supporting frame units. A front end of each armrest rod has a joint. A lower end of the joint has an accommodating chamber. A side wall of the accommodating chamber has at least one receiving opening. An engaging plate is detachably inserted in the receiving opening. The engaging plate has a through hole. When the spherical head is inserted in the accommodating chamber and passes through the through hole, the engaging plate is engaged with the engaging groove.

Abstract: An apparatus and a method for measuring blood flow of vessels are provided. The apparatus includes a light source, a light splitting module, a reference arm module, a sample arm module, a probing module, and a control system. The sample arm module includes a scanning unit and an optical-path shifting device. A probe light is obtained from the light splitting module, and a central line of a main light of the probe light extends through a rotation axis of the scanning unit. The probe light is reflected by the scanning unit to the optical-path shifting device. When the optical-path shifting device is rotated between a first position and a second position respectively, the probe light scans a vessel in fundus to obtain a first phase shift signal and a second phase shift signal blood flow rates and total blood flow of all the vessels near an optic disc are determined.

Abstract: An apparatus and a method for measuring blood flow of vessels are provided. A light source, a light splitting module, a reference arm module, a sample arm module, a probing module, and a control system are arranged; the sample arm module includes a scanning unit and an optical-path shifting device; a probe light is obtained from the light splitting module, and a main light of the probe light is on a rotating shaft of the scanning unit; the probe light is reflected by the scanning unit to the optical-path shifting device, when the optical-path shifting device is in a first position and in a second position respectively, the probe light scans a vessel in fundus to obtain a first phase shift signal and a second phase shift signal blood flow rates and total blood flow of all the vessels near an optic disc are determined.

Abstract: A subjective eye refractometer includes an imaging lens and a target, the front surface of the cornea of a testee is located at a focal point of the imaging lens, the target and an eye of the testee are respectively located on two sides of the imaging lens along an optical axis of the imaging lens, and the target can move forward and backward along the optical axis by means of setting, and the subjective eye refractometer is marked with a value D1 for identifying a spherical refractive-power along a movement path of the target, a movement position x is obtained by subtracting a focal distance f0 from an object distance of the target, when the testee sees the target clearly, the spherical refractive-power of glasses to be worn on the eyes is the corresponding spherical refractive-power D1 at the movement position x of the target. The invention further discloses a subjective refractometry method.