Lens optics, system and method for using lens optics

Description

State of the art

[0001] The invention relates to a passive optical attachment according to claim 1, a system according to claim 12 and a method for using a passive optical attachment according to claim 13.

[0002] From the prior art, for example EP 3 591 568 A2, an active attachment optics for code reading devices is already known, which has its own active illumination device, in particular its own light sources.

[0003] Passive attachment optics are known, for example, from US 6 595 422 B1.

[0004] The object of the invention is, in particular, to provide a generic device with improved structural properties. This object is achieved according to the invention by the features of claims 1, 12, and 13, while advantageous embodiments and further developments of the invention can be found in the subclaims. Advantages of the invention

[0005] The invention relates to a passive attachment optics for use with at least one light source unit of a code reading and / or code verification device, hereinafter also generally referred to as image sensor, with an optical unit, wherein the optical unit has at least one lens for changing an imaging beam path of the code reading and / or code verification device.

[0006] Such a configuration can advantageously improve, and in particular simplify, a design. In addition, assembly and / or manufacture of an auxiliary optics can be simplified, which in turn can reduce costs, in particular manufacturing costs. Furthermore, efficiency, in particular assembly and / or product and / or labor efficiency, can be increased. Particularly advantageously, simple assembly and / or disassembly of the auxiliary optics on an image sensor can be enabled, in particular to change at least one beam path of the image sensor. In addition, a passive auxiliary optics can be provided, wherein active units, such as light sources, can be dispensed with, since the auxiliary optics is designed for use with at least one light source unit of the image sensor.Furthermore, the lens attachment can potentially be modular in design and adapted specifically for use with the image sensor's light source unit. Advantageously, the lens attachment can be adapted for different recording conditions and provided to a user.

[0007] According to the invention, the auxiliary optics are designed as passive auxiliary optics, free of active units such as illumination sources. In an assembled state, the device preferably forms a subassembly of a code reading and / or code verification system comprising the code reading and / or code verification device.

[0008] According to the invention, the image sensor comprises at least the light source unit. In an operating state, the light source unit could provide light for illuminating an illuminated area. Advantageously, at least the light source unit is individually controllable and / or switchable. In particular, the light source unit generates the provided light in the operating state with at least one light source. The light source and at least one further light source of the light source unit could be aligned parallel to one another. Particularly preferably, the light source and the further light source could be individually controllable and / or switchable. In the operating state, the light source and the further light source could provide light, in particular simultaneously.The light source and / or the further light source could provide light for illumination independently of control of the other light source, in particular the light source and / or the further light source. In addition, the light source unit and at least one further light source unit of the image sensor, in particular the light source and at least the further light source, could be switchable and / or controllable in at least one group. It would also be conceivable for the attachment optics to independently, in particular automatically, select and / or adjust a setting for illumination by at least the light source unit. The image sensor is intended in particular to record and advantageously evaluate an image of the illumination area. It would be conceivable for the image sensor to have a camera and / or an optical measuring device and / or a control device.The image sensor could potentially provide images of objects within the illumination area for determining identifying features and / or measured variables and / or images of objects for performing control functions, such as a completeness check. If the image sensor is configured as a code reading and / or code verification device, the image sensor is advantageously designed to read and / or verify at least one code arranged in the illumination area.

[0009] The auxiliary optics are intended for use with the image sensor, with at least the light source unit. In particular, the light source unit, in the mounted state and in an operating state, could illuminate the illumination region through the auxiliary optics. Advantageously, the auxiliary optics has at least one light receiving region, which is intended in particular to receive the light provided by the light source unit and preferably to allow it to pass through unhindered. Particularly advantageously, the auxiliary optics has at least one light processing region, which is intended in particular to process the light provided by the light source unit and thus to illuminate the illumination region. Preferably, the light processing region is arranged downstream of the light receiving region along an illumination beam path of the provided light.The optical unit could process the light provided by the light source unit, advantageously in the light processing area, wherein the provided light penetrates in particular through the light receiving area into the light processing area.

[0010] The attachment optics is a passive attachment optics. The passive attachment optics is free of active units such as dedicated light sources and / or switchable optical units. The passive attachment optics can be used with the light source unit. The attachment optics could be removable from the image sensor. For example, the attachment optics could be releasably attached to the image sensor by a snap connection and / or screw connection. Preferably, the attachment optics can be plugged onto the image sensor. A method for using the attachment optics with the image sensor could consist of several sub-steps. In a first sub-step of the method, the attachment optics is connected to the image sensor. In the mounted state, the attachment optics is connected to the image sensor, in particular fixed.

[0011] According to the invention, the auxiliary optics are provided for changing an imaging beam path of the image sensor. In a second sub-step of the method, the imaging beam path is changed by the auxiliary optics. The imaging beam path is, in particular, a geometric profile of a beam path of the image sensor, which passes through the auxiliary optics and by means of which the image sensor records and advantageously evaluates the image, preferably within the illumination region. In particular, the image sensor has a detector unit for recording the image by means of the imaging beam path. In particular, the lens is located along the imaging beam path between the detector unit and the illumination region and / or imaging region.

[0012] The optical unit could comprise a plurality of passive optical units known to those skilled in the art for providing illumination and / or influencing the imaging beam path, such as, for example, the lens and / or a mirror and / or a filter and / or an optical light guide, such as an image guide and / or a fiber bundle. In the assembled state, the optical unit preferably changes the imaging beam path of the image sensor. The lens provided for this purpose could, for example, be a diverging lens or, advantageously, a converging lens. The converging lens could be a biconvex, plano-convex, or concave-convex lens. In particular, the lens is spherical or aspherical or has a freeform geometry. In the assembled state, and particularly in the operating state, the imaging beam path runs through the lens. The optical unit could comprise a lens receptacle into which the lens can be inserted.

[0013] The lens attachment could have a housing. The housing could at least partially surround and / or define an interior space. The optical unit could be arranged at least partially within the interior space. In the assembled state, the lens receptacle is fixed to the housing in a force-locking and / or form-locking manner, for example, by means of a plug-in connection and / or a rotary connection and / or a screw connection and / or a snap-in connection of the lens attachment. The lens attachment and / or the image sensor could, for example, consist at least partially and / or largely of a mineral and / or a metal and / or a plastic and / or a composite material. The term "largely" is understood to mean, for example, at least 55%, advantageously at least 65%, preferably at least 75%, particularly preferably at least 85%, and particularly advantageously at most 95% of a volume and / or mass fraction.In this case, the lens attachment could be made at least partially and preferably at least largely of the same material as the image sensor. The lens attachment could be manufactured at least partially and / or largely by means of an injection molding process or, preferably, by means of a 3D printing process.

[0014] "Intended" here and below means specifically programmed, designed, and / or equipped. The term "intended" for an object to perform a specific function means that the object fulfills and / or performs this specific function in at least one application and / or operating state.

[0015] The auxiliary optics are proposed for use with the code reading and / or code verification device having the optical unit, wherein the optical unit comprises at least the lens for modifying an imaging beam path of the code reading and / or code verification device. This advantageously improves, in particular simplifies, the design of an auxiliary optics adapted to a code reading and / or code verification device. Furthermore, the auxiliary optics can be used without active units of the code reading and / or code verification device, such as a light source unit of the code reading and / or code verification device.

[0016] The attachment optics is preferably a telecentric attachment optics for generating an at least approximately telecentric beam path. According to the invention, the lens is provided to convert a divergent imaging beam path of the image sensor, in particular of the code reading and / or code verification device, into an at least substantially telecentric imaging beam path, which defines an imaging region. A telecentric imaging beam path can image the smallest disturbances and / or defects and / or unevenness in an object's surface. Furthermore, the attachment optics can be used, for example, for object measurements, since an object size of the object advantageously changes only very slightly when an object distance of the object is varied.

[0017] The imaging area could differ from the illumination area; in particular, the imaging area could be smaller and / or larger than the illumination area. Advantageously, a dimension of the imaging area differs from a dimension of the illumination area by, in particular, at most 30%, advantageously by at most 10%, preferably by at most 5%, and particularly preferably by at most 1%. Particularly preferably, the imaging area lies in the illumination area and is thus a sub-area of ​​the illumination area. In addition, the imaging area could be at least substantially identical to the illumination area. In particular, the image sensor is provided to record and preferably evaluate an image of the imaging area, which is advantageously illuminated by the light source unit.Preferably, the telecentric imaging beam path runs at least substantially parallel to an optical axis of the image sensor. A telecentric beam path, in particular the telecentric imaging beam path, could deviate from the optical axis by, in particular, at most 5%, advantageously by at most 2%, preferably by at most 1%, and particularly preferably by at most 0.5%. It would be conceivable for an entrance pupil of the image sensor and / or the detector unit, which functions in particular as an aperture stop of the image sensor, to be arranged in a focal plane of the lens.

[0018] In order to provide a modular attachment optics that is particularly adaptable for use with a light source unit of an image recorder, it is proposed that the attachment optics have a set of holding units, each holding at least parts of a light unit of the attachment optics, wherein the optical unit has a coupling unit and the holding units of the set of holding units are interchangeable with one another and connectable to the coupling unit. Furthermore, the attachment optics can be adapted such that different light source units of the image recorder, in particular with different geometries, can be used. Furthermore, the attachment optics can be adapted to different image field angles. Furthermore, by simply inserting and / or pulling a holding unit into / out of a housing of an attachment optics, simple and / or time-saving and / or convenient assembly and / or disassembly can be enabled.The holding unit could be insertable into the housing, for example, pluggable. Preferably, the coupling unit fixes the holding unit to an inner wall of the housing. In the mounted state, the holding unit could have at least a positive contact with the image sensor. The holding unit could have at least one recess, which is provided in particular to form a passage connection for the light provided by the light source unit. The recess is advantageously adapted in size and / or shape and / or dimension to at least the light source.

[0019] According to the invention, the passive attachment optics comprises a light unit designed to redirect light provided by at least the light source unit of the code reading and / or code verification device toward the imaging region. This allows the imaging quality of an image produced by an image sensor to be improved, particularly by illuminating an illumination region in a structurally simple manner. Furthermore, despite coaxially supplied illumination from a light source unit, an imaging region and / or an illumination region can be advantageously illuminated. Furthermore, preferred bright-field illumination can be provided. The light unit preferably comprises passive optical elements known to those skilled in the art for influencing the provided light, such as, for example, a mirror, a filter, and / or an optical waveguide.The light unit could be irreversibly connected to the holding unit. Alternatively, the light unit could be replaceable and advantageously insertable into and / or removable from the holding unit.

[0020] It is proposed that the light unit comprise a beam splitter, which is provided for aligning at least one illumination beam path of the provided light, in particular of the light source unit. This allows the light provided by the light source unit to be advantageously aligned, thus providing a preferred illumination beam path. Furthermore, the illumination quality of an illuminated area can be improved in a structurally simple manner. Furthermore, the design of an optical unit comprising the light unit can be simplified.

[0021] The beam splitter is preferably designed to transmit light reflected from the illumination region at least partially, in particular to an intensity fraction of at least 30%, advantageously at least 50%, preferably at least 60%, and particularly preferably at least 80%, in particular to allow the reflected light to pass through free of scattering processes and / or reflections. The beam splitter is advantageously designed as a beam splitter cube. The beam splitter cube is, in particular, a cubic element having at least one semi-transparent mirror, which forms, for example, a side surface of the cubic element and preferably a diagonal surface of the cubic element.

[0022] The optical unit, preferably the holding unit, has at least one receiving area for at least form-fitting reception of the beam splitter. The beam splitter cube could be reversibly insertable into the receiving area. For example, the receiving area could have at least one protruding edge and / or at least one frame and / or at least one recess formed as a negative of the structural unit / component. In particular, the beam splitter contributes to the generation of a particularly directed beam path, wherein the illumination beam path preferably leads from the light source unit of the image sensor to the illumination area via deflection at the beam splitter, and the imaging beam path, starting from the illumination area, passes the beam splitter and runs to the detector unit.

[0023] It would be conceivable for the light unit to have an additional lens through which the beam splitter directs the illumination beam path. Preferably, the light unit has the lens, and the beam splitter directs the illumination beam path through the lens. This allows for a compact and / or simplified attachment optics. Furthermore, additional lenses for modifying the illumination beam path can be dispensed with, thus advantageously increasing product efficiency. In particular, product and / or manufacturing costs can be reduced.

[0024] In particular, the optical unit and the light unit are at least partially formed as a single piece. "Single piece" is understood to mean at least materially connected, for example, by an adhesive process, a welding process, an injection molding process, and / or another process deemed appropriate by a person skilled in the art, and / or formed in one piece, such as by production using a single-component or multi-component injection molding process and / or by production from a single casting and / or a stamping process from a single blank. "Single piece" could possibly also be understood as "one-piece." In particular, the provided light illuminates the imaging area through the lens. The lens could be located along the illumination beam path between the beam splitter and the illumination area and / or imaging area.The illumination beam path could be divergent, convergent, or diffuse. In particular, the illumination beam path between the beam splitter and the lens could be diffuse. It is also conceivable for the illumination beam path to illuminate the imaging area coaxially.

[0025] The light unit is preferably designed to provide an at least substantially telecentric illumination beam path. This enables advantageous illumination of an imaging region, specifically a telecentric illumination beam path can be provided by means of which the smallest disturbances and / or defects and / or unevenness in a surface of an object can be illuminated and / or imaged with an image sensor. In particular, the telecentric illumination beam path runs at least substantially parallel to the telecentric imaging beam path. The diffuse illumination beam path could pass through the lens. The lens preferably changes the diffuse illumination beam path into an at least substantially telecentric illumination beam path.

[0026] In order to provide more efficient illumination and a more compact design for an attachment optic, it is proposed that the light unit have a diffuser arranged along the illumination beam path in front of the beam splitter. This advantageously allows an imaging area to be uniformly illuminated despite possible unevenness and / or slight roughness and / or defects on a surface of an object, wherein an illumination beam path of a provided light advantageously strikes the surface of the object at an angle of incidence deviating from a perpendicular angle of incidence. In particular, the diffuser is arranged in the light processing area. The diffuser is provided to convert a preferably direct light passing through the diffuser, in particular the provided light, into diffuse scattered light, preferably diffuse illumination light.The diffuse illumination light is, in particular, light that emerges from the light processing area toward the illumination area and preferably has not yet reached the illumination area. In particular, the diffuse illumination light strikes the beam splitter. The beam splitter preferably feeds the diffuse light into a coaxial illumination beam path, which could possibly pass through the lens.

[0027] The diffuser could comprise at least one translucent material and is advantageously formed from such a material. The translucent material is, in particular, a material that has a scattering factor of, for example, at least 50%, advantageously at least 70%, and particularly advantageously at least 90%. A "scattering factor" of a body is understood to mean, in particular, a ratio of a scattered light intensity, advantageously an intensity of the scattered light, on an output side of the body to an input light intensity on an input side of the body.

[0028] An absorption element of the light unit could be arranged along the illumination beam path downstream of the diffuser, in particular on a side of the beam splitter opposite the diffuser. Advantageously, the absorption element forms a coating on a side surface of the beam splitter. The absorption element is intended to absorb a portion of the light transmitted by the illumination region during a deflection of the light provided by the light source of the light source unit and / or the diffuse scattered light and / or the diffuse illumination light, in order to prevent the influence of unwanted light, in particular stray light. The stray light, in particular stray light, could be light that enters undesired areas of the attachment optics and / or the image sensor.

[0029] It would be conceivable for the holding unit to have a diffusely reflecting surface designed to reflect the provided light to the beam splitter. The diffusely reflecting surface could be arranged at a mirrored position of the entrance pupil of the image sensor and / or the detector unit. Alternatively and / or additionally, it would be conceivable for the holding unit to have a first reflection surface and / or at least one second reflection surface designed to increase the amount of light incident on the diffusely reflecting surface.

[0030] In further embodiments of the invention, it is proposed that the light unit comprise a light guide, which is designed to guide the provided light, at least in sections, to the imaging area. Thus, when used with the auxiliary optics, the light provided by a light source unit of an image sensor can be advantageously directed by the auxiliary optics. Furthermore, an imaging area can be advantageously and efficiently illuminated. Furthermore, the design of the auxiliary optics can be significantly improved, in particular simplified, by means of the light guide.

[0031] The light guide could be reversibly insertable into an opening in the holding unit. For example, the opening could have at least one protruding edge and / or at least one frame and / or at least one recess formed as a negative of the assembly / component, so that the light guide can be arranged at least positively in the opening.

[0032] The light guide could advantageously illuminate the first reflection surface and / or the second reflection surface. The light guide could have at least one flat entry area for the provided light, which is advantageously adapted to a dimension and / or shape and / or size of the light source. Alternatively, the light guide could also transmit light from two flat entry areas. On a side facing away from the entry area, the light guide could have a radiation surface for the provided light. The radiation surface could have an angle of at least 20°, advantageously 30°, and preferably 45°, so that the light guide directs the provided light towards the diffusely reflecting surface by means of total internal reflection.

[0033] Alternatively and / or additionally, the light guide could be made at least partially and / or largely of a mineral, such as glass, and / or a plastic and / or a composite material. The light guide could have a curved shape. The light guide could be at least partially formed as a single piece, preferably in one piece. The holding unit may have a diaphragm through which the light guide guides the provided light to the beam splitter. The diaphragm could be arranged along the illumination beam path upstream of the beam splitter and downstream of the light guide.

[0034] It is proposed that the light guide be designed to release the provided light directly into the imaging region. This enables intensive and direct illumination of an imaging region. Furthermore, the light can illuminate the imaging region without interference, in particular avoiding the use of additional optical units. Furthermore, dark-field illumination can be provided. In particular, the light guide releases the provided light into the imaging region without any prior, in particular optical, interference with the illumination beam path. The provided light could illuminate the imaging region directly and advantageously be free from passage through the optical element, for example the beam splitter and / or the lens.

[0035] Furthermore, it is proposed that the light unit comprise a further light guide, which is intended to guide the provided light, at least in sections, to the imaging area. This can increase efficiency and, in particular, enable more intensive illumination of an illumination area and / or an imaging area. The further light guide could guide the provided light from the light source and / or a further light source of the light source unit, at least in sections, to the imaging area. Alternatively and / or additionally, the further light guide could emit the provided light directly into the imaging area.

[0036] In the assembled state and in the operating state, the light provided by the light guide and the additional light guide could illuminate the imaging area and / or the illumination area. In particular, the illumination beam path passes through the light guide and / or the additional light guide.

[0037] In order to provide maximum illumination efficiency of an illumination region and / or an imaging region, it is proposed that the light guide and the further light guide provide light at different angles of incidence in the imaging region. In addition, dark field illumination can thus be provided, in particular precisely at different angles of incidence. The provided light could be guided through the light guide into the imaging region at an angle of incidence of, for example, at least 10°, advantageously at least 20°, preferably at least 30°, and particularly preferably at most 70°. The further light guide could provide a further angle of incidence of, for example, at least 5°, advantageously of at least 10°, preferably of at least 20°, and particularly preferably of at most 70° for the provided light.In particular, the angle of incidence and the further angle of incidence differ from one another by, for example, at least 2°, advantageously at least 5°, preferably at least 10°, and particularly preferably by at most 50°. In order to simplify the attachment and / or detachment of an optical unit to / from the image sensor, it is proposed that the auxiliary optics have a fastening unit for, in particular, detachable attachment of the optical unit to the image sensor, in particular the code reading and / or code verification device. In addition, a design of an auxiliary optics can be improved such that the optical unit can be connected to and / or detached from the image sensor in an efficient and / or rapid manner. In particular, the auxiliary optics can be attached to / with the image sensor only when needed.

[0038] The fastening unit could be formed at least partially in one piece, and preferably in one piece, with the housing and / or the optical unit. In particular, the fastening unit and the housing and / or the optical unit could have at least one common component. Advantageously, the fastening unit functions as an attachment, which is intended to provide reversible fastening of the optical unit and / or the housing to the image sensor. Particularly preferably, the fastening unit could be used as an adapter, allowing the optical unit to be fixed to many different image sensors.

[0039] The invention further relates to a method for using a passive optical attachment with a code reading and / or code verification device, wherein an imaging beam path of the code reading and / or code verification device is changed by the passive optical attachment. This can increase efficiency and / or flexibility and / or convenience with regard to changing an imaging beam path.

[0040] The passive optical attachment is not intended to be limited to the application and embodiment described above. In particular, the passive optical attachment may comprise a number of individual elements, components, and units that differs from the number stated herein to fulfill a functionality described herein. Drawings

[0041] Further advantages will become apparent from the following description of the drawings. Several embodiments of the invention are illustrated in the drawings. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will also expediently consider the features individually and combine them into useful further combinations.

[0042] They show: Fig. 1 a system designed as a code reading and / or code verification system with an image sensor and an attachment lens, Fig. 2 a modular lens attachment, Fig. 3 a sectional view of the system in a mounted state of the attachment optics, Fig. 4 a schematically illustrated method for using the attachment optics, Fig. 5 a detailed view of an alternative holding unit for an attachment lens, Fig. 6the alternative holding unit in an unassembled state of a light guide of a light unit of the attachment optics, Fig. 7 a rear view of the alternative holding unit in the unassembled state of the light guide, Fig. 8 a detailed view of the light guide, Fig. 9 a sectional view of an alternative system in a mounted state of the attachment optics on an image sensor of the system Fig. 10 a detailed view of an alternative design of a light guide of a light unit of an attachment optic, Fig. 11 another detailed view of the alternative design of the light guide, Fig. 12 another detailed view of another alternative holding unit of an attachment lens, Fig. 13 a sectional view of another alternative system in a mounted state of the attachment optics, Fig. 14 another detailed view of another alternative holding unit of an attachment lens, Fig. 15the further alternative holding unit in a sectional view, Fig. 16 a sectional view of another alternative system in a mounted state of the attachment optics, Fig. 17 another alternative system with an image sensor and an alternative lens attachment in an unassembled state, Fig. 18 a sectional view of the system in the unassembled state, Fig. 19 the alternative attachment optics in a top view, Fig. 20 a sectional view of a side view of the alternative attachment optics and Fig. 21 another sectional view of another side view of the alternative attachment optics. Description of the embodiments

[0043] The Figure 1shows a system 10a designed as a code reading and / or code verification system with an image sensor 14a known from the prior art and designed as a code reading and / or code verification device 16a. The system 10a has an auxiliary optics 12a, which is designed as a passive auxiliary optics 12a.

[0044] The image sensor 14a has a light source unit 18a. The light source unit 18a has light sources 56a, each arranged in the shape of a flat circle on the light source unit 18a. All of the light sources 56a are aligned parallel to one another. The light sources 56a are identical to one another, which is why only one of the light sources 56a is provided with a reference numeral and is described in more detail below. The light source unit 18a provides light for illuminating an illumination area 31a. All of the light sources 56a can be individually switched and / or controlled. In addition, the light sources 56a can be switched and / or controlled in at least one group.

[0045] In contrast to the Figure 1 , which represents an unassembled state of the attachment optics 12a, shows the Figure 3a mounted state of the auxiliary optics 12a, wherein the auxiliary optics 12a is mounted on the image sensor 14a. This is the Figure 3 a sectional view of system 10a. The Figure 2 It can be seen that the attachment optics 12a has a modular design.

[0046] The auxiliary optics 12a is intended for use with the light source unit 18a of the image sensor 14a. The auxiliary optics 12a has an optical unit 20a. The optical unit 20a has a lens 22a and is intended for changing an imaging beam path 24a of the image sensor 14a (see FIG. Figure 3). For the removable attachment of the optical unit 20a to the image sensor 14a, the attachment optics 12a has a fastening unit 50a. The fastening unit 50a is formed as a part of the optical unit 20a and, in the present case, functions as an attachment for placement on the image sensor 14a. In the mounted state, the fastening unit 50a fixes the optical unit 20a to the image sensor 14a (cf. Figure 3). The auxiliary optics 12a has a housing 60a. In the present case, a lens receiving unit 62a of the optical unit 20a is fixed to the housing 60a in a force-fitting and form-fitting manner by means of screws 64a of the auxiliary optics 12a. The auxiliary optics 12a has several screws for fixing the lens receiving unit 62a to the housing 60a, which screws are identical to one another and consequently only one of the screws is provided with a reference symbol. The lens receiving unit 62a is provided for receiving the lens 22a. In the mounted state, the lens receiving unit 62a receives the lens 22a and fixes the lens 22a (cf. Figures 2 and 3 ).

[0047] The Figure 2It can be seen that the optical unit 20a has a holding unit 54a. The holding unit 54a can be inserted into the housing 60a. In the assembled state, the holding unit 54a can be coupled to a coupling unit 52a of the optical unit 20a in such a way that the coupling unit 52a fixes the holding unit 54a in the housing 60a (cf. Figure 3 ). The coupling unit 52a is arranged on an inner wall of the housing 60a. In the present case, the attachment optics 12a has a set of holding units 54a, wherein the optical unit 20a has a coupling unit 52a and the holding units 54a of the set of holding units 54a are interchangeable and connectable to the coupling unit 52a. Figures 5 to 16Different versions of the holding unit 54a can be seen. The attachment optics 12a is modular in design, at least to the extent that the holding unit 54a is adaptable for use with the light source unit 18a of the image sensor 14a. The attachment optics 12a is adaptable for different recording conditions (see Figure 2 ). The holding unit 54a could have at least one recess 86a, which is provided in particular to form a passage connection for the light provided by the light source unit 18a.

[0048] The auxiliary optics 12a has a light receiving region 68a, which is intended to receive the light provided by the light source unit 18a. Furthermore, the auxiliary optics 12a has a light processing region 70a, which processes the provided light. The light processing region 70a is arranged downstream of the light receiving region 68a along an illumination beam path 36a of the provided light (see FIG. Figure 3 ).

[0049] The Figure 3shows that the lens 22a is provided to convert a divergent imaging beam path 26a of the image sensor 14a into an at least substantially telecentric imaging beam path 28a, which defines an imaging region 30a. A detector unit 90a of the image sensor 14a is provided to capture an image from the imaging region 30a using the imaging beam path 24a. An entrance pupil 92a of the image sensor 14a is located in a focal plane of the lens 22a.

[0050] In the present case, the imaging area 30a lies within the illumination area 31a (cf. Figure 3 ).

[0051] To provide illumination of the imaging area 30a, the attachment optics 12a has a light unit 32a, which is intended to redirect the light provided by at least the light source unit 18a of the image sensor 14a toward the imaging area 30a. In this case, the provided light comes from the light source 56a, but could alternatively also come from multiple light sources 56a. The holding unit 54a is intended to hold at least parts of the light unit 32a. In this case, the light unit 32a has a beam splitter 34a, which is intended to align at least one illumination beam path 36a of the provided light. The beam splitter 34a is designed as a beam splitter cube. The beam splitter 34a has a semi-transparent mirror 72a, which forms a diagonal surface of the beam splitter cube. The beam splitter 34a is inserted into a receiving area 74a of the holding unit 54a (cf. Figure 2 and3 ).

[0052] In this exemplary embodiment, the light unit 32a has a diffuser 38a (cf. Figure 3 ). The diffuser 38a is arranged along the illumination beam path 36a in front of the beam splitter 34a. In this embodiment, the light unit 32a has the lens 22a, and the beam splitter 34a directs the illumination beam path through the lens 22a (see Figure 3 To prevent deflection of the provided light and / or stray light, the light unit 32a has an absorption element 66a. The absorption element 66a is formed as a coating on a side surface of the beam splitter 34a.

[0053] One in Figure 4The schematic flow diagram shown of a method for using the auxiliary optics 12a with the image sensor 14a comprises a first method sub-step 76a and a second method sub-step 78a. In this exemplary embodiment, the second method sub-step 78a is carried out after the first method sub-step 76a in terms of a temporal progression. In the first method sub-step 76a, the auxiliary optics 12a is fixed to the image sensor 14a. In the second method sub-step 78a, the imaging beam path 24a of the image sensor 14a is changed by the auxiliary optics 12a.

[0054] In the Figures 5 to 21Further embodiments of the invention are shown. The following descriptions and the drawings are essentially limited to the differences between the embodiments, whereby with regard to identical components, features and functions, in particular with regard to components with the same reference numerals, reference is also made to the drawings and / or the description of the other embodiments, in particular the Figures 1 to 4 To distinguish the embodiments, the letter a in the reference numerals of the embodiment in the Figures 1 to 4 and by the letters b and f in the reference numerals of the embodiments of the Figures 5 to 21 replaced.

[0055] The Figures 5 to 7each show a detailed view of an alternative holding unit 54b of an optical unit 20b. Here, a light unit 32b of an attachment optics 12b has a light guide 42b, which is intended to guide light provided by a light source unit 18b of an image sensor 14b, at least in sections, to an imaging area 30b (cf. Figure 9 ). The holding unit 54b has an opening 88b into which the light guide 32b can be inserted (cf. Figures 5 to 7 ). The light guide 42b is a curved element for guiding the provided light (cf. Figure 8 ). In the present case, the light unit 32b and / or the light guide 42b is intended to provide a telecentric illumination beam path 40b of the provided light (cf. Figure 9 ). The telecentric illumination beam path 40b runs parallel to a telecentric imaging beam path 28b.

[0056] The Figures 10 and 11show an alternative embodiment of a light guide 42c of a light unit 32c. In this case, the light guide 42c is angularly shaped and guides the provided light along the indicated illumination beam path 36c.

[0057] In addition, the Figures 12 and 13 an alternative holding unit 54d of an alternative optical unit 20d of an auxiliary optical unit 12d, as well as an alternative system 10d with the auxiliary optical unit 12d and an image sensor 14d in an assembled state. In this exemplary embodiment, the holding unit 54d has a diffusely reflecting surface 80d instead of a light guide 42d of a light unit 32d. To amplify the amount of diffusely reflecting light from the diffusely reflecting surface 80d, the holding unit 54d has a first reflecting surface 82d. In the present case, the holding unit 54d has at least one second reflecting surface 84d opposite the first reflecting surface 82d.

[0058] For even stronger illumination, the Figures 14 to 16 a further embodiment of an alternative holding unit 54e of an alternative optical unit 20e of an auxiliary optics 12e, wherein a light unit 32e of the auxiliary optics 12e has at least one light guide 42e and another light guide 44e. The light guide 42e and the another light guide 44e are provided for illuminating a diffusely reflecting surface 80e (cf. Figures 14 and 15 ).

[0059] The Figures 17 to 21 In each case, a further alternative design of an attachment lens 12f can be seen, whereby the Figures 17 and 18 show a system 10f designed as an alternative code reading and / or code verification system.

[0060] In this case, a light guide 42f of a light unit 32f of the attachment optics 12f is provided to release the provided light directly into an imaging area 30f (cf. Figures 20 and 21). The light guide 42f releases the provided light into the imaging area 30f at an angle of incidence 46f.

[0061] In addition, the light unit 32f has a further light guide 44f, which is intended to guide the provided light at least partially to the imaging area 30f. The further light guide 44f guides the light from a further light source 58f of the light source unit 18f. The further light source 58f is designed identically to the light source 56f. The further light guide 44f releases the provided light directly into the imaging area 30f. In the present case, the light guide 42f and the further light guide 44f provide the light with different angles of incidence 46f, 48f in the imaging area 30f. Figure 21 shows that a further angle of incidence 48f of the provided light is smaller than the angle of incidence 46f. Reference symbol

[0062] 10 System 12 Attachment optics 14 Image sensor 16 Code reading and / or code verification device 18 Light source unit 20 Optical unit 22 Lens 24 Imaging beam path 26 Imaging beam path 28 Imaging beam path 30 Imaging area 31 Illumination area 32 Light unit 34 Beam splitter 36 Illumination beam path 38 Diffuser 40 Illumination beam path 42 Light guide 44 Additional light guide 46 Angle of incidence 48 Angle of incidence 50 Fastening unit 52 Coupling unit 54 Holding unit 56 Light source 58 Light source 60 Housing 62 Lens receiving unit 64 Screw 66 Absorption element 68 Light receiving area 70 Light processing area 72 Semi-transparent mirror 74 Recording area 76 Process sub-step 78 Process sub-step 80 Diffusely reflecting surface 82 Reflecting surface 84 Reflecting surface 86 Recess 88 Aperture 90 Detector unit 92 Entrance pupil

Claims

1. A passive attachment optics (12a-f) for use with at least one light source unit (18a-f) of a code reading and / or code verification device (16a-f), comprising an optics unit (20a-f) having at least one lens (22a-f) for changing an imaging beam path (24a-f) of the code reading and / or code verification device (16a-f), the lens (22a-f) being configured to change a divergent imaging beam path (26a-f) of the code reading and / or code verification device (16a-f) to an at least substantially telecentric imaging beam path (28a-f) that defines an imaging area (30a-f), and comprising a lighting unit (32a-f) configured to deflect light provided by at least the light source unit (18a-f) of the code reading and / or code verification device (16a-f) in the direction of the imaging area (30a-f).

2. The passive attachment optics (12a-e) of claim 1, characterized in that the lighting unit (32a-e) includes a beam splitter (34a-e) configured to orient at least one illuminating beam path (36a-e) of the light provided.

3. The passive attachment optics (12a-e) of claim 2, characterized in that the lighting unit (32a-e) includes the lens (22a-e) and that the beam splitter (34a-e) directs the illuminating beam path through the lens (22a-e).

4. The passive attachment optics (12a) of claim 2 or 3, characterized in that the lighting unit (32a) includes a diffusor (38a) arranged along the illuminating beam path (36a) in front of the beam splitter (34a).

5. The passive attachment optics (12b-e) of any one of the preceding claims, characterized in that the lighting unit (32b-e) is configured to provide an at least substantially telecentric illuminating beam path (40b-e).

6. The passive attachment optics (12b-f) of any one of the preceding claims, characterized in that the lighting unit (32b-f) comprises a light guide (42b-f) configured to direct the light provided to the imaging area (30b-f) at least in portions.

7. The passive attachment optics (12f) of claim 6, characterized in that the light guide (42f) is configured to release the light provided directly into the imaging area (30f).

8. The passive attachment optics (12f) of claim 6 or 7, characterized in that the lighting unit (32f) includes a further light guide (44f) configured to guide the light provided to the imaging area (30f) at least in portions.

9. The passive attachment optics (12f) of claim 8, characterized in that the light guide (42f) and the further light guide (44f) provide light with different incident angles (46f, 48f) in the imaging area (30f).

10. The passive attachment optics (12a-f) of any one of the preceding claims, characterized by a fastening unit (50a-f) for, in particular detachably, fastening the optics unit (20a-f) to the code reading and / or code verification device (16a-c).

11. The passive attachment optics (12a-e) of any one of the preceding claims, characterized by a set of holding units (54a-e), each holding at least parts of a lighting unit (32a-e) of any one of claims 1 to 9, wherein the optics unit (20a-e) includes a coupling unit (52a-e) and the holding units (54a-e) of the set of holding units (54a-e) are interchangeable with one another and connectable to the coupling unit (52a-e).

12. A code reading and / or code verification system comprising at least one passive attachment optics (12a-f) of any one of the preceding claims and comprising the code reading and / or code verification device (16a-c).

13. A method for using the passive attachment optics (12a-f) of any one of claims 1 to 11 with a code reading and / or code verification device (16a-f), wherein an imaging beam path (24a-f) of the code reading and / or code verification device (16a-f) is changed by the passive attachment optics (12a-f).